Hello everyone,
"The LTE standard can be used with many different frequency bands. In North America, 700 and 1700 MHz are planned to be used; 800, 1800, 2600 MHz in Europe; 1800 and 2600 MHz in Asia; and 1800 MHz in Australia. As a result, phones from one country may not work in other countries. Users will need a multi-band capable phone for roaming internationally." (en.wikipedia.org)
So far, I have not heard of any LTE cell phone able to adapt to this multi-frequency international situation.
Even within the USA, it does not seem possible for an unlocked LTE cell phone which has been bought through one carrier to be used with another one.
Well, it should be possible !
After all, LTE is an international standard supporting all frequency bands, flexible bandwidth and both FDD and TDD duplexes ...
So it might not be that difficult to make these phones be able to use different LTE frequencies.
All radio systems can easily scan the whole spectrum in order to settle on the next available or desired channel. Another example, on Android Gingerbread phones :
"Settings-->Wireless & Networks-->Mobile Networks-->Network Operators--> Search Network" shows you all the mobile carriers available in your area, offering you the possibility to manually register on a specific network.
All this means that it should be technically possible to buy an unlocked LTE cell phone in the US for example, buy a sim card in another country where the LTE frequency is different, and everything should work fine, maybe with some software tweak.
Has anybody tried this already ?
Related
I would like to thank the Moderators and all the members for making this site and forum so fun and informative.
Doing a little research I was able to unlock my T-Mobile XDA and use a Cingular SIM.
Cingular is slated to turn on their 850mhz GSM in a matter of weeks if not days. I know that my T-Mobile uses 1900 mhz, so even with the Cingular SIM in place it is "piggy backing" on the T-Mobile towers. Even after the Cingular GSM network is online I will still be using T-Mobiles towers/network because of the 1900 mhz band constraints of my phone.
My question is this: is there currently or will there be (XDA II) an XDA that can use the 850mhz GSM band?
TIA
Ray
I noticed I knew little about this, so I figured this would be the case the case for most users outside of the Americas. I Googled around a little, the results are below.
Management summary: no, the XDA II will not support the 800-850 band. There will be a few quad-band phones, and some dual 800/1900.
http://www.phonescoop.com/glossary/term.php?gid=115 said:
GSM 850
(GSM 800)
GSM 850 is simply GSM technology operating in the Cellular (800 MHz / 850 MHz) frequency band. Both the technology and frequency band have been around for a long time, but only in 2002 were they combined.
In the U.S. prior to 2002, GSM technology only operated in the PCS (1900 MHz) frequency band.
GSM 850 addresses the needs of carriers with Cellular licenses switching from other technologies to GSM.
Before the existence of GSM 850, the Cellular band was commonly referred to as the "800 MHz" band. "850 MHz" implies a different frequency band, but this is not the case. "800 MHz" and "850 MHz" refer to the exact same frequency band. 850 is technically a more accurate description of the frequency range, but 800 is the original, and more common term.
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http://www.cellular-news.com/forum/viewthread.php?tid=708 said:
By installing GSM at 800Mhz, all we're doing is reusing the same frequencies used for AMPS/TDMA and adding GSM to them. The US has always had 800Mhz for wireless services. Nothing strange about that since there have been wireless services in that band since the beginnings of cellular. The use of GSM at 800Mhz is nothing surprising and only a natural move for carriers who are licensed to use this band. There's no law saying that GSM should be confined to 1900Mhz in the US. Europe and the rest of the world have gone Dual Band on GSM (900/1800) a long time ago. Why can't the US do the same? Besides, it is not only Cingular and AT&T, the largest TDMA/GSM US operators, who are adopting GSM 800. There are many other carriers throughout the rest of the Americas, including Canada, who use the same US frequencies and are deploying GSM 800. GSM 800 will be just as necessary and as popular as TDMA/CDMA/Analog at 800Mhz. The market for GSM 800 is just as big as the TDMA 800 market since almost all TDMA operators are moving to GSM.
Dual band GSM 800/1900 phones will be the most common GSM phones in the US soon because single band 1900Mhz GSM phones will be good for T-Mobile only which is a 1900-only carrier in the US. Just think that Cingular and AT&T amass about 40 million users as opposed to T-Mobile's 10 Million. Also, quad-band GSM phones will be more common slowly but eventually. Nothing crazy about having 4 bands since the world has had 4 wireless bands for a long time, it's only that GSM had only made it to 3 of the 4 bands and now finally made it to the 4th. For starters, look at the Motorola V600 and the NEC 515 which are the first quad-band to my knowledge.
In the future, look for more bands as the wireless industry expands into 2100Mhz and 700Mhz. Finally, the US will see other types of tri-band GSM phones, such as those that will work on 800/1900 for the US and EITHER 900 OR 1800 for other regions.
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sunray said:
I would like to thank the Moderators and all the members for making this site and forum so fun and informative.
Doing a little research I was able to unlock my T-Mobile XDA and use a Cingular SIM.
Cingular is slated to turn on their 850mhz GSM in a matter of weeks if not days. I know that my T-Mobile uses 1900 mhz, so even with the Cingular SIM in place it is "piggy backing" on the T-Mobile towers. Even after the Cingular GSM network is online I will still be using T-Mobiles towers/network because of the 1900 mhz band constraints of my phone.
My question is this: is there currently or will there be (XDA II) an XDA that can use the 850mhz GSM band?
TIA
Ray
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This link http://www.mobilemag.com/content/100/344/C2017/ may be the answer to your query and will may so happy :lol:
:lol: :lol:
LOL That PDA Phone on that link is refering to CDMA technology, NOT GSM.
Look at the fine print dude.
chocodough said:
LOL That PDA Phone on that link is refering to CDMA technology, NOT GSM.
Look at the fine print dude.
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Sorry I missed read the article but overall I'm only trying to help
I don’t know how to find out what band my smartphone uses. It’s T-Mobile, so it should sell in US, where GSM band’s 1900. But my T-mobile was in box, designed especially for Russia. The letters are in Russian, a GSM band indicated on the box in big black font is 900\1800.
But device information tab in WM 2003 displays "Hardware Version: PW 10B1" (as far as I understand that means 1900 band). In spite of this on the back of my device is a sticker with PW10A2 sign. Where's the truth?
Maybe my device uses 1800 frequency?
But anyway in the band selection tab there's only 2 bands 800 and 1900 (
If my device supports 1800 band, how can I activate it?
The seller’s support tells T-mobile MDA supports 1800… But they can’t explain how to enable it.
I don't know whether connected my second problem with previous. I think it is.
Sometimes my device doesn't find network after it lost it. Example: after leaving an underground subway station. To find a network I have to turn the phone off and then to turn it on.
My radio version is T310. If this problem doesn't connected with the first, maybe I just should change a radio version to a newer one?
The sticker tells the truth normally. Are you going in to bootloader to choose your band?
How can I choose GSM band through boot loader?
Enter bootloader by holding power button while pushing stylus in reset hole, when bootloader appears push the button below antenna, you will then have all gsm options, choose 900/1800.
You may be S O L!!!
You better hope your XDA is not a 900/1800 MHz one otherwise you're going to be SOL unless you plan on living overseas because here in North America, the wireless carriers like AT&T Wireless, Cingular Wireless LLC and T Mobile USA use EDGE/GSM/GPRS on the 850 and/or 1900 MHz GSM aka Next Generation network. 900/1800 MHz GSM is used overseas and is considered the international GSM bandwidths. Cheers!
You may be S O L!!!
You better hope your XDA is not a 900/1800 MHz one otherwise you're going to be SOL unless you plan on living overseas because here in North America, the wireless carriers like AT&T Wireless, Cingular Wireless LLC and T Mobile USA use EDGE/GSM/GPRS on the 850 and/or 1900 MHz GSM aka Next Generation network. 900/1800 MHz GSM is used overseas and is considered the international GSM bandwidths. Cheers!
Hey,
The T9193 version of the HD2 has the radio bands 850/2100 in it for HSDPA 3G speeds, but just the 850 band is needed to support AT&T's 3G service in the US.
Would it be possible to create a new radio ROM that disables/turns-off the 2100 band for U.S. users, since this band is useless anyway, and it may help extend the battery life of our HD2 by not having to power the 2100 section of the radio, especially if it makes any transmit attempts by the phone on the 2100 band (transmitting uses a lot more power then receiving).
Any chance of this?
JohnCody said:
Hey,
The T9193 version of the HD2 has the radio bands 850/2100 in it for HSDPA 3G speeds, but just the 850 band is needed to support AT&T's 3G service in the US.
Would it be possible to create a new radio ROM that disables/turns-off the 2100 band for U.S. users, since this band is useless anyway, and it may help extend the battery life of our HD2 by not having to power the 2100 section of the radio, especially if it makes any transmit attempts by the phone on the 2100 band (transmitting uses a lot more power then receiving).
Any chance of this?
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T-mobile is also using HSPDA/3G @ 850 also and nowhere else? I hope so because pretty much half or better of the users of these forums are T-Mobile and *not* AT&T subscribers. Jus sayin.
JohnCody said:
Hey,
The T9193 version of the HD2 has the radio bands 850/2100 in it for HSDPA 3G speeds, but just the 850 band is needed to support AT&T's 3G service in the US.
Would it be possible to create a new radio ROM that disables/turns-off the 2100 band for U.S. users, since this band is useless anyway, and it may help extend the battery life of our HD2 by not having to power the 2100 section of the radio, especially if it makes any transmit attempts by the phone on the 2100 band (transmitting uses a lot more power then receiving).
Any chance of this?
Click to expand...
Click to collapse
ROM cooks do not have such fine grain control over radio bands.... Sorry.
I don't believe the T9193's radio has the 2100 Mhz band, otherwize I'd be able to use it in my area to get 3G coverage. (We only have Edge on the 850 Mhz band here)
Hopefully someone who knows for sure can answer this.
JohnCody said:
Hey,
The T9193 version of the HD2 has the radio bands 850/2100 in it for HSDPA 3G speeds, but just the 850 band is needed to support AT&T's 3G service in the US.
Would it be possible to create a new radio ROM that disables/turns-off the 2100 band for U.S. users, since this band is useless anyway, and it may help extend the battery life of our HD2 by not having to power the 2100 section of the radio, especially if it makes any transmit attempts by the phone on the 2100 band (transmitting uses a lot more power then receiving).
Any chance of this?
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Click to collapse
Hi mate,
you already tried this?
In Dialer > Menu (right soft-buttom) > Baseband > Band Frequency
or
Start > Settings > Personal Settings > Phone
But 850 Mhz is just for GSM not WCDMA... it's right?
2udCrRAZdK said:
I don't believe the T9193's radio has the 2100 Mhz band, otherwize I'd be able to use it in my area to get 3G coverage. (We only have Edge on the 850 Mhz band here)
Hopefully someone who knows for sure can answer this.
Click to expand...
Click to collapse
I'm pretty sure the T9193 has the 2100 band, but 2100 is useless in the US because AT&T uses 850/1900 for 3G. The T9193 is an Australian phone made for Telstar (their cell phone company). The 3G bands used over there are 850/2100. So, because AT&T also uses the 850 band, thats why we are able to use this phone with AT&T's 3G here over in the US.
However, the 2100 band of the phone is useless in the US because is was intended to be used for 3G in australia.
The good news is that AT&T is phasing out the 1900 band for 3G and switching everything over to 850, so the HD2 will just get more and more 3G coverage as time goes on and then even the 1900 band won't be used anymore so it would be irrelevant if the HD2 has a 1900 band or a 2100 band because both would be useless.
NRGZ28 said:
ROM cooks do not have such fine grain control over radio bands.... Sorry.
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Click to collapse
Gotcha - thanks for the info.
2udCrRAZdK said:
I don't believe the T9193's radio has the 2100 Mhz band, otherwize I'd be able to use it in my area to get 3G coverage. (We only have Edge on the 850 Mhz band here)
Hopefully someone who knows for sure can answer this.
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Click to collapse
Well, you neglected to say where "here" is
The best available combination for world-wide 3G access is 850/2100 Mhz. This is because:
1) 850Mhz is used in Canada, US, S Americas, Aus, S Africa for 3G broadcasting in regional areas (and in some city areas)
2) 2100Mhz is used in Asia, EU, Aus cities for 3G broadcasting
This is due to the actual physics of velocity = frequency x wavelength
Some telcos use 1900Mhz in the cities, but also broadcast in 850Mhz
Other telcos use 900Mhz in the regional areas, but also broadcast in 2100Mhz in the cities
ATT in the US uses 850mhz in the regionals and 1900Mhz in the cities. This ensures that "their" PDA's cannot use other SIM's - I have no idea why the dumbed-down US market meekly accepts that
The perfect combo is tri-frequency hardware, such as PDA manufacturers used to provide but do not any more (no excuses, it's just straight cost-cutting and sleight-of-hand marketing BS to suit the greedy telcos)
The HD2 released in Aus through Telstra is hardware-filtered for 2100/850 Mhz, the best available combo for world-wide use (not perfect, of course)
The HD2 released in EU/Asia is 2100/900 Mhz. This will access 3G in most cities world-wide (note that China uses 2100/850) but has limited coverage in regional areas - yes, I know there many 900 Mhz deployments but these are very limited geographically
The HD2 released in the US is 1900/850 Mhz. This is very limited for world-wide cities and excludes 3G coverage for those countries that use 2100/900 Mhz
None of this has any relation to GSM coverage, so please do not confuse them
Is the hardware actually different?
I live in NZ and unfortunately bought a T-Mobile unit which is set up for 1700/2100mHz which means that when in the cities I get full broadband, but in the regions I only get dial up speeds through GSM.
My question is does anyone know if the hardware could actually use the 900mhz broadband - or is it a pipe dream on my part that hopefully someone will release a ROM to access some previously hidden hardware?
I do recall with my Touch that there was a GPS built into the hardware that no-one was aware of for a year or two!
mikey555 said:
I live in NZ and unfortunately bought a T-Mobile unit which is set up for 1700/2100mHz which means that when in the cities I get full broadband, but in the regions I only get dial up speeds through GSM.
My question is does anyone know if the hardware could actually use the 900mhz broadband - or is it a pipe dream on my part that hopefully someone will release a ROM to access some previously hidden hardware?
I do recall with my Touch that there was a GPS built into the hardware that no-one was aware of for a year or two!
Click to expand...
Click to collapse
The hardware is definitely different...
JohnCody said:
The T9193 is an Australian phone made for Telstar (their cell phone company).
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The Phone company in Australia is Telstra (just in case you are goggling it and wonder why you cant find it)
t9193 vodafone
i can use 900/2100 bands on t9193
i use Vodafone australia on Telstra hd2 with quick 3g data everywhere
what are the hardware differences?????
am i alone?
is there anyone else in this community that has
T9193 + Vodafone AUS + Custom ROM/Radio
Everyone keeps pasting crap about incompatibility but it seems to be fine
Hello,
I currently have US Cellular and i have great service in my area. My girlfriend wants to switch to US Cellular also due to the fact that in our area T-Mobile sucks. She currently has a Vibrant and wants to switch but doesnt want to pay big bucks for another android phone similar to the vibrant. So i suggested unlocking the phone and putting the service on the vibrant. The only problem is i dont think US Cellular uses sim cards. I currently have a samsung acclaim and it does not haev a sim card. So what i was wondering is if i am able to switch my services over to her phone even tho i dont have a sim card?
Thanks in advance,
Jacob
T-Mobile = GSM (digital Antenna digital frequency)
US Cellular = CDMA (Analog frequency with simulated digital properties) TDMA (straight up old school analog, Think... Radio)
CDMA networks keep all your information sever side, whereis a GSM network uses your SIM Card to Identify you.
You should be able to get a phone from any of the following Carriers (as long as it is not imei Locked (reported as stolen)
Sprint CDMA/PCS 1900, 2100
Verizon CDMA 800, 1900, 2100
Alltel CDMA 800, 1900
Regional Carriers Technology Bands
Metro PCS CDMA 800, 1900
U.S. Cellular CDMA 800, 1900
Edge Wireless CDMA 800, 1900
more information
U.S. Cellular is a large multi-regional carrier offering service in 155 markets - in 26 states - across the country. The company primarily uses CDMA technology, and also provides legacy TDMA service. Most coverage is cellular-band (800 MHz), with some PCS (1900 MHz) areas in the Central region.
(so what this means is check your local area for Coverage and make sure the CDMA phone you purchase supports BOTH 800/1900 Frequencies.
I have looked for days now across multiple forums to get some insight on this issue:
I want to use my Thunderbolt in Thailand. Haven't found any threads that speak of success, only conjecture that it won't work.
Homework I've done (unless i understand it incorrectly):
- Verizon 3G operates on the 850 / 1900 mhz cdma band. Radio Frequency Summary
" The following is a list of known frequencies which Verizon employs in the United States:
Frequencies used on the Verizon Network
Frequency Protocol Class
850 MHz 1xRTT/EV-DO/eHRPD 3G
1900 MHz 1xRTT/EV-DO/eHRPD 3G
700 MHz LTE 4G
1700/2100 MHz(AWS) LTE 4G"
- Truemove, a popular mobile company in Thailand has early links to Verizon and their 3G service operates on the 850mhz wcdma band
"What should I do if I want to use TrueMove 3G service but I don’t have a 3G 850 MHz mobile phone?
Basically, it’s not that all mobile phones work on any band. Each 3G compatible mobile phone supports different bands. For example, if you have a 3G 2.1 GHz or 900 MHz or 2G mobile phone, you will not be able to use TrueMove 3G service because TrueMove offers 3G service on 850 MHz band.
If you want to enjoy TrueMove 3G service, it is recommended that you buy a 3G WCDMA 850 MHz mobile phone or visit any True Shops and ask for a 3G compatible mobile phone. True Shops also sell different smartphones that support different mobile platforms e.g. iPhone 3G/3GS, BlackBerry Bold 900/Bold 9700 and Motorola Milestone."
- I spoke with verizon after reading other forums about 'unlocking' thunderbolts and was told that the thunderbolt comes unlocked, so unlocking wouldn't be necessary anyway.
- Lastly, it seems that many people have successfully put a 3G SIM into a 4G SIM slot on there phone and received 3G service.
....So what am I missing? What would prevent me from being able to use my Thunderbolt in Thailand for simple 3G service if the carrier (Truemove) works on cdma based bands? What extra might I have to do to get it to work?
PS: Sorry I can't insert the links directly in the post. Not allowed since this is my first post.
Thanks for any help