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I'm thinking about buying an unlocked Vibrant to use on AT&T, will the 3G work on AT&T network? Thanks.
Yes utilizing UMTS Band II 1900 MHz
lqaddict said:
Yes utilizing UMTS Band II 1900 MHz
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Actually, the rumor going around the internet that you can only use At&t 1900mhz on the Vibrant is false.
The vibrant can also utilize wcdma 850mhz. So you should have no problems picking up both 3G signals from At&t.
I will work on making a how to video that shows how to make the vibrant pick up the wcdma 850, takes litterly 2 minutes to do.
Remember, you might run into other annoying problems such as setting up visual voicemail to work with At&t.
SamsungVibrant said:
Actually, the rumor going around the internet that you can only use At&t 1900mhz on the Vibrant is false.
The vibrant can also utilize wcdma 850mhz. So you should have no problems picking up both 3G signals from At&t.
I will work on making a how to video that shows how to make the vibrant pick up the wcdma 850, takes litterly 2 minutes to do.
Remember, you might run into other annoying problems such as setting up visual voicemail to work with At&t.
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I saw Band V in the service menu, but I had no luck enabling it, so it seems; here in NYC ATT is using UMTS Band II and the Vibrant has no issues picking it up, I am getting upward to 3Mb/s down speeds
Here's an entire thread dedicated to it http://forum.xda-developers.com/showthread.php?t=735461 I was one of the non-believers until I tried an ATT SIM in my unlocked Vibrant.
lqaddict said:
I saw Band V in the service menu, but I had no luck enabling it, so it seems; here in NYC ATT is using UMTS Band II and the Vibrant has no issues picking it up, I am getting upward to 3Mb/s down speeds
Here's an entire thread dedicated to it http://forum.xda-developers.com/showthread.php?t=735461 I was one of the non-believers until I tried an ATT SIM in my unlocked Vibrant.
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Umm interesting thread, similar to what we are doing.
So are you saying you are not able to pick up the wcdma 850 (FDD V) band? We set this up on a friends phone, with his At&t sim, it works.
Can you try setting your phone to wcdma 850 only, and drive to a location that has 850 signal, then check under basic information, you should be getting at&t 850 3g.
vietphunguyen said:
I'm thinking about buying an unlocked Vibrant to use on AT&T, will the 3G work on AT&T network? Thanks.
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Dear Vietphunguyen, there seems to be controversy. We know for certain the vibrant can pick up att 3g signal using 1900 band, but the question is, what about 850. Me and a friend believe the vibrant can also get 850, but that link the other poster provided is something to note also.
Be safe, don't purchase the vibrant yet, until we test this more. 2 make sure you can pick up both 1900 and 850 bands.
I dont know much about the Vibrant just yet, but if its anything like the iPhone on TMO's towers, it might not work. The problem was with ATT using a single band for 3g (1900mhz) to send the recieve but TMO uses 2 bands, 1 to send and 1 to recieve... If this helps at all I dunno! lol
Apexsilverevo said:
I dont know much about the Vibrant just yet, but if its anything like the iPhone on TMO's towers, it might not work. The problem was with ATT using a single band for 3g (1900mhz) to send the recieve but TMO uses 2 bands, 1 to send and 1 to recieve... If this helps at all I dunno! lol
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Thank you, just to clarify, for people visiting this thread.
At&t uses 2 differend 3G bands, one is 1900mhz and the other is 850 mhz. At&t is starting to implement 850 towers. Naturally, you would want a phone that picks up both bands.
Now, we know for CERTAIN, the VIbrant will 100 percent pick up At&t 3G 1900mhz signals. The question is, which we are uncertain of, will the Vibrant also pick up 850mhz band 3G signal, incase you hapen to drive to an at&t area that only has this band.
clearer?
Ok guys I have an atrix 4g running on t-mobile. My question is why cant I get 4g/3g on this phone ? T-mobile runs on the 2100 band and the phone does support that band so why no 4g or 3g? common sense would tell me that if t-mo runs 4g on 2100 and the phone is capable of running on 2100 that it would work. have searched for a total of about 4 hours or so over the past couple days and cant find a straight answer only thing i can find is that att doesnt run on 2100 band yet the phone does. thanks in advance to anybody that can answer and taking the time to read.
are you getting H+ or H? (This is "3.5g") The Atrix 4g is not a true 4g phone.
Because the 2100 spectrum that you're using the phone on now is part of the quad-band gsm which is edge/2g. The difference lies in the bands used for 3g/4g, in which case AT&T only uses 850/1900 and tmobile only uses 1700/2100.
There is also a bunch of things that include HSPA, AWS, WCDMA, and so on and so on but I don't know enough about that to comment.
EDIT: Also, the only phones I know that can be used on both AT&T and Tmobile 3g/4g are "penta-band" phones like some European Nokia phones and the unlocked Galaxy Nexus that needs to be imported as well.
shattar01 said:
Ok guys I have an atrix 4g running on t-mobile. My question is why cant I get 4g/3g on this phone ? T-mobile runs on the 2100 band and the phone does support that band so why no 4g or 3g? common sense would tell me that if t-mo runs 4g on 2100 and the phone is capable of running on 2100 that it would work. have searched for a total of about 4 hours or so over the past couple days and cant find a straight answer only thing i can find is that att doesnt run on 2100 band yet the phone does. thanks in advance to anybody that can answer and taking the time to read.
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Wcdma=utms=3g
Yes, WCDMA and AWS(1700), as far as I know, are both from UMTS and the differences in regards to 3G between AT&T and Tmobile lie in the spectrum use (850&1900 vs 1700&2100). And both AT&T and Tmobile use HSPA(+) based off their respected UMTS frequencies.
I just don't understand the "leap" in GSM technology that breaks the quad-band compatibility, that's all.
matthew5025 said:
Wcdma=utms=3g
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Also I've read 850 is att's main spectrum for large areas and 900 for T-Mobile. All higher spectrums are for smaller, rural areas.
If your looking for 3g maybe find a town or, buy a dual band amplifier? That's IF they have 2100 MHz band working where you are located.
Lower bands ie 850/900 are the download streams. 1700/1900/2100 are upload streams. If I'm not mistaken
Also a T-Mobile vibrant supports att, it also has our main band, 850mhz. Again which is the main large areas, like T-Mobile 900mhz. 1700-2100mhz for att/T-Mobile range is only as good as the towns that still has that band currently operating for hspa/3g data. I've seen alot of T-Mobile phones that have 850/1900/2100, and work on att. If they were 1600/1900/2100 did not for me.
You need that lower frequencies to ensure it to work. Then....
Also for regional based frequencies...
http://en.m.wikipedia.org/wiki/Universal_Mobile_Telecommunications_System
That link will let you know what that all really means.
I think you are mixing up gsm and umts.
GSM = 2G/Edge
UMTS (HSPA, HSPA+, HSDPA/HSUPA, WCDMA, AWS) = 3G
Have a look here. You will see they label "3G" as "UMTS" which is HSPA/WCDMA. A little more down you can see they label their data as "HSDPA", which is download, and "HSUPA" which is upload. Further delineating the speeds they label either one as UMTS for down and Edge as up, which to me tells me they use gsm for the upload and only use UMTS for download. Either way, there is not a T-mobile phone available that can be unlocked and used on AT&T's 3G, just 2G and vice versa. As I have previously mentioned, you will need a penta-band phone for that.
Ciloteille said:
Also I've read 850 is att's main spectrum for large areas and 900 for T-Mobile. All higher spectrums are for smaller, rural areas.
If your looking for 3g maybe find a town or, buy a dual band amplifier? That's IF they have 2100 MHz band working where you are located.
Lower bands ie 850/900 are the download streams. 1700/1900/2100 are upload streams. If I'm not mistaken
Also a T-Mobile vibrant supports att, it also has our main band, 850mhz. Again which is the main large areas, like T-Mobile 900mhz. 1700-2100mhz for att/T-Mobile range is only as good as the towns that still has that band currently operating for hspa/3g data. I've seen alot of T-Mobile phones that have 850/1900/2100, and work on att. If they were 1600/1900/2100 did not for me.
You need that lower frequencies to ensure it to work. Then....
Also for regional based frequencies...
http://en.m.wikipedia.org/wiki/Universal_Mobile_Telecommunications_System
That link will let you know what that all really means.
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And don't get me wrong, I'm not trying to give anyone a hard time but it's misinformation to tell anyone that a T-mobile phone can work on AT&T 3G.
And I'll say it again, I'm not an expert so if anyone can better explain then I'm all ears (eyes).
live4nyy said:
I think you are mixing up gsm and umts.
GSM = 2G/Edge
UMTS (HSPA, HSPA+, HSDPA/HSUPA, WCDMA, AWS) = 3G
Have a look here. You will see they label "3G" as "UMTS" which is HSPA/WCDMA. A little more down you can see they label their data as "HSDPA", which is download, and "HSUPA" which is upload. Further delineating the speeds they label either one as UMTS for down and Edge as up, which to me tells me they use gsm for the upload and only use UMTS for download. Either way, there is not a T-mobile phone available that can be unlocked and used on AT&T's 3G, just 2G and vice versa. As I have previously mentioned, you will need a penta-band phone for that.
And don't get me wrong, I'm not trying to give anyone a hard time but it's misinformation to tell anyone that a T-mobile phone can work on AT&T 3G.
And I'll say it again, I'm not an expert so if anyone can better explain then I'm all ears (eyes).
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I am just merely stating that I have a motorola defy on ATT, and it worked great for a long time with great speeds before I got a motorola atrix and infuse.
Im not saying that every tmobile phone will have working talk/text, or data for that matter. I have just posted an idea, or atleast what to look for when you are cruising for phones not labeled for your carrier.
I was getting my motorola defy with the att "grand fathered internet" for 10 dollars a month and it was about 160-420KB/s down, and 80-190KB/s up. but some phones are capable of this, others arent. I have a general idea, and have played with several different carrier cellphones and used them with att and att's 3g data.
Rogers HTC Dream (x2 of them)
Telus Milestone
Tmobile Defy
Rogers Atrix
ATT Atrix (x2 of them)
ATT Infuse
Rogers and Telus actually use the same 3G bands as AT&T so as long as those are unlocked they will work. And I'm not saying an unlocked T-mobile can't work on AT&T, because they can (they both use quad-band gsm) but you can not use an unlocked T-mobile phone an AT&T 3G. That's all I'm saying.
Now, they did make an European version of the Defy that uses the 850 3G band but not the T-mobile "branded" one.
I'm going to stick to my guns on this one because I don't want to give anyone the wrong idea about interchanging AT&T and T-mobile phones and expecting 3G service. I'm fairly certain about this and unless someone can prove otherwise that's how I will think.
Ciloteille said:
I am just merely stating that I have a motorola defy on ATT, and it worked great for a long time with great speeds before I got a motorola atrix and infuse.
Im not saying that every tmobile phone will have working talk/text, or data for that matter. I have just posted an idea, or atleast what to look for when you are cruising for phones not labeled for your carrier.
I was getting my motorola defy with the att "grand fathered internet" for 10 dollars a month and it was about 160-420KB/s down, and 80-190KB/s up. but some phones are capable of this, others arent. I have a general idea, and have played with several different carrier cellphones and used them with att and att's 3g data.
Rogers HTC Dream (x2 of them)
Telus Milestone
Tmobile Defy
Rogers Atrix
ATT Atrix (x2 of them)
ATT Infuse
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---------- Post added at 08:47 AM ---------- Previous post was at 08:36 AM ----------
Upon further research, I have found this article, where under certain circumstances, you can use an unlocked AT&T iPhone with T-mobile 3G:
http://www.gsmarena.com/tmobile_usa_running_1900mhz_3g_in_some_areas_iphones_invited-news-3537.php
Now, this shows that an AT&T phone can maybe use T-mobile 3G but not the other way around. Again, I'm always up for learning something new but I need references/proof.
Well I do get att 3g on the defy and vibrant. I am currently getting about 300ish KB/s on them and 600+KB/s on my attic, I'm just going with the facts. Those facts are that certain T-Mobile phones will work with Att, provided they have 850mhz band. That allows you in most towns (near me) to get 3g
False.
300KB/s is Edge speed, which is only 2G.
http://en.wikipedia.org/wiki/2G
http://www.phonescoop.com/glossary/term.php?gid=107
That's why you get faster speeds on the Atrix because it actually uses 3G.
Again, both AT&T and T-mobile use quad-band GSM. Which is why you can unlock a T-mobile phone and use it on AT&T, and vice versa, but it is only 2G/Edge and NOT 3G.
http://www.phonescoop.com/glossary/term.php?gid=139
http://www.phonescoop.com/glossary/term.php?gid=3
Furthermore, here are the wiki pages for AT&T and T-mobile which both inlcude frequency charts outlining the technology (2G or 3G) each one uses:
http://en.wikipedia.org/wiki/AT&T_Wireless
http://en.wikipedia.org/wiki/T-Mobile_USA
Here are the charts:
AT&T:
Frequency Protocol Class
Frequencies used on the AT&T Network
850 MHz GSM/GPRS/EDGE 2G
1900 MHz GSM/GPRS/EDGE 2G
850 MHz UMTS/HSPA 3G
1900 MHz UMTS/HSPA 3G
700 MHz LTE 4G
T-mobile:
Frequency Band Protocol
850 MHz GSM/GPRS/EDGE 2G
1900 MHz GSM/GPRS/EDGE 2G
1700 MHz UMTS (W-CDMA)/HSPA/HSPA+ 4G (formerly 3G[34])
1900 MHz UMTS (W-CDMA)/HSPA/HSPA+ 4G
I check for facts and references, I'm only saying what I find in research.
Again, when unlocked, a T-mobile phone can use AT&T 2G/Edge, not 3G
Ciloteille said:
Well I do get att 3g on the defy and vibrant. I am currently getting about 300ish KB/s on them and 600+KB/s on my attic, I'm just going with the facts. Those facts are that certain T-Mobile phones will work with Att, provided they have 850mhz band. That allows you in most towns (near me) to get 3g
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I am thinking about trying to get an sgs iii and wondering if it is possible to get it on the $30.00 mo 100min unl data plan through walmart?
I have the exhibit ii on this plan, had it for a couple months, anybody know how I would do this?
If it will work with Tmobile band why not, best to ask the source. I don't think we have a Wal Mart rep guru here.
Sure you can, if you don't want 3G.
Sent from my HTC One X using xda premium
You have prepaid plan, you can put your sim into just about any unlocked GSM phone (and T-Mobile phones) and use it. If you want a good phone right now, get the Galaxy Nexus (GSM), it supports T-Mobile 3G (1700/2100 band). T-Mobile version of SIII will be coming later.
thanks for the responses, a Galaxy Nexus is probably a more realistic option than the sgs3 price wise, going to take a good look at it on the play store.
cheers.
T-Mobile and AT&T both support compatible band.
the SGS3 uses HSDPA 850 / 900 / 1900 / 2100
T-Mobile uses HSDPA 900 / 1700 / 2100
AT&T uses HSDPA 850 / 1700 / 1900 / 2100
now we play match the bands. we see at&t shares 3 bands with the international SGS3, thats great. T-Mobile shares 1, not as awesome, but 1 band is enough.
its true what theyre saying up there about "only having 2G", well i should correct myself, it WAS true. however recently T-Mobile has upgraded their 2100 band to 3G, as theyve been expanding. so it will work fine on Walmart's plan, as they use T-Mobile's network.
T-Mobile will come out with an SGS3 later in the year, for SGS2 it was 6 months behind the international version. the T-Mobile version will use HSDPA 900 / 1700 / 2100. what do more compatible bands mean? well it means if youre in an area you normally wouldnt get good 2100 band signal, you may get 1700 signal. if you live in the city, youll see no difference at all, its only when youre in rural areas.
so in short; you can totally use the i9300 SGS3 on tmobiles network, and yes, you will have HSDPA 3G
soraxd said:
T-Mobile uses HSDPA 900 / 1700 / 2100
now we play match the bands. we see at&t shares 3 bands with the international SGS3, thats great. T-Mobile shares 1, not as awesome, but 1 band is enough.
its true what theyre saying up there about "only having 2G", well i should correct myself, it WAS true. however recently T-Mobile has upgraded their 2100 band to 3G, as theyve been expanding. so it will work fine on Walmart's plan, as they use T-Mobile's network.
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Could really use a source for this, please. Everything i've looked up has suggested that their HSPA+ is only 1700 and 2100, and that phones with only 2100 would not work.
thebobp said:
Could really use a source for this, please. Everything i've looked up has suggested that their HSPA+ is only 1700 and 2100, and that phones with only 2100 would not work.
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you know what, i made a mistake, i was using this
http://support.t-mobile.com/docs/DOC-4261
looking at the bands the T-Mobile One S (along with all other tmobile phones) support, but the 900 band is just added to the phone so it can be used if taken abroad. so my mistake.
to reiterate the sgs3 will only work on 2g on tmobile, it will only work on at&t for 3g.
im glad you questioned it, i would have gone along giving bad information
I know it's been posted a few times before regarding whether or not the international version of the Galaxy S III will be compatible on Canadian Carriers (In my case, TELUS) but I am just wondering if it can in fact work. Here's why I ask:
I live in Kelowna, British Columbia, and my current phone is a Galaxy S II from Bell Mobility. I unlocked it back in August of last year to use it on the TELUS network. It ran on the 850/900/1900/2100 MHz bands and I had no issue with using it on TELUS at HSPA+ speeds. With the Galaxy S III it runs on the same bands, so shouldn't it work? Now I've seen people saying that it still requires the 1700 MHz frequency (same idea with T-Mobile), however in my location there is no cellular tower that supports the 1700 MHz frequency (according to Canadian Cellular Towers Map). The only frequencies in Kelowna are 850 and 1900 actually.
This being said, shouldn't the Galaxy S III work in my area if I were to continue with my pre-order for the International variant?
[EDIT]
Also, just to point out, the HTC One S, which is also just released on TELUS, also opperates on the same frequencies as the Galaxy S III International.
I think you'll be fine.
And if the international version doesn't work from wherever you buy it from, I'm sure you can return it.
That's the premise I'm going on with SaskTel.
@MaesterB: Yeah I think so too. I spoke with a TELUS rep now and he claims that the 850/1900 MHz frequencies are enough to handle up to 42Mbps download speeds, and the 1700 MHz is primarily for the LTE coverage areas (Vancouver, Toronto, etc). Of course, in my area my Galaxy S II can only hit up to 6-8 Mbps anyways so I'm not overly concerned.
Exactly.
In Regina, we have "4G" but the fastest I can get is like up to 5MB anywhere in the city.
So, the International SGS3, running on 3g/4g...should be just fine.
Hi,
The story is here:
I owned a korean version i9100 (M250K) and flash it with the latest CM10 nightly version (20120908, band version I9100XXLPW). It works well with my current carrier, which operate at 2100mhz frequency.
I will travel to US next weeks and plan to purchase T-mobile pay by days data plan, but because T-mobile US operate in a confusing 1700/2100mhz frequency, I am curious to know whether my 9100 can run in 4G speed or only 2G(GPRS) supported.
So my questions are:
1. is there any code to check current supported frequency band in my 9100?
2. if my current band firmware not support T-mobile 4G, which version band firmware is recommended?
thanks in advance!
Jeff
ctos said:
Hi,
The story is here:
I owned a korean version i9100 (M250K) and flash it with the latest CM10 nightly version (20120908, band version I9100XXLPW). It works well with my current carrier, which operate at 2100mhz frequency.
I will travel to US next weeks and plan to purchase T-mobile pay by days data plan, but because T-mobile US operate in a confusing 1700/2100mhz frequency, I am curious to know whether my 9100 can run in 4G speed or only 2G(GPRS) supported.
So my questions are:
1. is there any code to check current supported frequency band in my 9100?
2. if my current band firmware not support T-mobile 4G, which version band firmware is recommended?
thanks in advance!
Jeff
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You won't get "4G" on T-mobile in the US with this phone no matter what you do. It lacks the HARDWARE capabilities to receive 1700 mhz for data. So it will only get up to Edge data speeds.
T-mobile USA's 3G and "4G" operates on the AWS band, which REQUIRES BOTH 1700 and 2100 mhz, as it uses one for uplink and the other for downlink.
If you want high speed data on the carrier's network, you will need to use AT&T, or someone who operates on AT&T's network, like StraightTalk or H20.
ctomgee said:
You won't get "4G" on T-mobile in the US with this phone no matter what you do. It lacks the HARDWARE capabilities to receive 1700 mhz for data. So it will only get up to Edge data speeds.
T-mobile USA's 3G and "4G" operates on the AWS band, which REQUIRES BOTH 1700 and 2100 mhz, as it uses one for uplink and the other for downlink.
If you want high speed data on the carrier's network, you will need to use AT&T, or someone who operates on AT&T's network, like StraightTalk or H20.
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Thanks ctomgee, it seems I should look to ATT for their prepaid package. Thank you again!:good: