[Q] Vibrant on AT&T - Vibrant Q&A, Help & Troubleshooting

Hey Guys,
I've got my Vibrant on AT&T but I seem to have a problem with the Vibrant modems, whenever I'm on the 2g/3g mode it'll stay on 3g until theres low reception then it'll drop to 2g. The problem is that once it drops to 2g it won't go back up to 3g, no matter if reception increases.
I saw a post in the development section about I9000 modems working on the Vibrant on the CM7 ROM, I've been trying the modems on the latest CM7 nightly, but even though they install fine I'm getting truly horrible signal. I've also tried a couple Captivate modems but I'm unsure whether they're meant for the CM7 ROM on the Vibrant or not, nothing I've tried seems to work well.
I'd post in the development section but I'm low on posts so I'm not allowed:
Would anyone know if I9000 or Captivate modems would work better on AT&T?
And possibly where I can find the modems that would work on the Vibrant with CM7?
Thanks, this problem has been bugging me for awhile already..

In Chicago area I have very strong 3g signal so it does not drop to 2g. On the other hand, when I was in Florida my phone stayed on 2G most of the time, but it would switch to 3G in more populated areas. I use KB5 modem.

Related

[Q] AT&T - Won't Switch between Edge and 3G

I've got my unlocked Vibrant running on AT&T, but I can't seem to get it to switch between Edge and 3G. I can go into the settings and set it to stay in WCDMA mode, but then when I'm in an area of bad reception I end up missing calls (All through VOIP).
When its setup for Edge/WCDMA it will stay in 3G at first, but when 3G gets too low and it goes to Edge it won't go back to 3G at all.
I've tried switching modem versions but I'm guessing its unrelated to that.. well, actually all Vibrant modems are going to be setup for Tmobile anyway, maybe a Captivate modem is the solution, I'll try that and get back.
Does anyone have any ideas of how I can get it to switch properly?
If this modem install doesn't work I'm all out of things to try.
Thanks.
As far as I know (and I could be wrong), you can't flash a Captivate modem to the Vibrant, it just makes the radio useless.
You will have to use Vibrant modems, since they are designed for the hardware IN the Vibrant.

CM7 data issue

Hi guys, sorry if this isn't the place to post this, I don't have the post count yet to ask in the CM7 thread in the development section.
Anywho, ever since I flashed CM7 on my phone, I haven't been able to get a good HSPA+ connection. It keeps wavering from H+ to 3G. And if I do get a connection to H+, it is dead slow (did speakeasy speed test and got .4 down .1 up).
I also did the ATT data fix, but that seems to not work either.
Any help to my problem?
Mine seems to jump between 3G & H but I never thought to blame it on the ROM. Speeds are solid on both so didn't see it as an issue. Also I flashed CM7 right when I pulled it out of the box so don't know if it did that on stock or not.
Sent from my SGH-I777 using Tapatalk
The only reason why I think it may have something to do with CM7 is because before I was unrooted stock rom, and I had consistent H+ signal, with 6-7 down 2 up. Ever since I flashed, it has been very sluggish. Even my old Desire had consistent H+ signal in the areas tested. Not sure what's going on. Maybe it's a setting that I need to tweak or turn on? Any help would be greatly appreciated.

[Q] 3G not working

i have a samsung galaxy vibrant t959 2.3.5 everything works great but it never connect to 3G is always on the EDGE network how can i get it to work on the 3G I KNOW THERES COVERAGE here its just the phone any help
Maybe its just tmobile, ive had the same problem for a while now, its just that i rarely get 3g and then some days i get it for ours
Sent from a cell tower to the XDA server to you.
Maybe try flashing a different modem. Since you are in Mexico another one entirely might be just what you need.
i try flashing a couple of modems but still no luck is there any modem that you can recomend please

AT&T Vibrant working..kinda. Any Suggestions?

Okay everyone. After alot of trial and error. I got my Samsung T-mobile vibrant working on AT&T. I'm running Whiskey Nextgen 2 Rom and everything seems to be working fine except signal strength. I've read about how the Vibrant only picks up 2 of the ATT signals or whatnot but I have NO signal inside the building where I work. My question is whether an AT&T radio can be flashed to the phone so that its basically an AT&T phone with decent signal. Any help would be greatly appreciated.
Yeah, you can flash a captivate radio.
Sent from my GT-I9000 using xda premium
Thanks Ali!
My girlfriend is using her vibrant on ATT without any issues. How good was the reception in the building before getting a vibrant?
T-Mobile Vibrant not working on 3G network from AT&T
Could you use 3G with AT&T network?, because I couldn´t, just Edge, which is very slow,any recomendations on this matter? I heard this device doesn´t support 850 mhz, is there any way to make it happen?
Zimmerman9 said:
Could you use 3G with AT&T network?, because I couldn´t, just Edge, which is very slow,any recomendations on this matter? I heard this device doesn´t support 850 mhz, is there any way to make it happen?
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No 850mhz. You can get AT&T 3g in the areas they use 1900mhz though.
Ultimate83 said:
My girlfriend is using her vibrant on ATT without any issues. How good was the reception in the building before getting a vibrant?
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Well I had a Captivate but it was stolen from my home during a burglary some months back. I had left it home because it was one of those "shut off" models that would constantly shut down on it own and I was using my more dependable iphone 3gs while at work. That being said, I had 3 bars inside the building. With the Vibrant on the ATT network, I'm sitting at 0. Cannot connect to the market or anything. At home, the Vibrant signal is fine but I need a happy medium and I'm still recuperating from the break-in so I cant just go out and purchase a new ATT phone at this time.
The more I read about flashing radios though, the more concerned I am about doing so. I was under the impression that the radio had to match the kernal and my kernal version is 2.6.32.9 so I dont know if the cappy radio will match.

[Q] [AU Telstra] H+, but no 3g

I have an SGSII on Telstra running darkyrom XXLPQ with KH3 modem. I've got an issue where data works fine on H+, but whenever the phone drops back to 3G I get absolutely nothing. I've tried disabling fast dormancy etc, but that just seems to reduce how often it falls back. Is there a modem I can use or a tweak that will let it get data on 3G as well as h+?
LethalCorpse said:
I have an SGSII on Telstra running darkyrom XXLPQ with KH3 modem. I've got an issue where data works fine on H+, but whenever the phone drops back to 3G I get absolutely nothing. I've tried disabling fast dormancy etc, but that just seems to reduce how often it falls back. Is there a modem I can use or a tweak that will let it get data on 3G as well as h+?
Click to expand...
Click to collapse
I think you are better off on T-model modem, like DVKF2 by telstra as that will work on your I9100T model best.
I have the same problem on stock 2.3.4, xeu. But it just about never drops back to 3g in Melbourne. So haven't bothered with telstra modem yet.
Sent from my GT-I9100 using xda premium
I have a feeling you don't understand this very well and if I'm wrong I'm truly sorry. Either move to an area that you know does not have hspa coverage (otherwise known as 3g+ or 3.5g or h+ or 4G in North America depending on the phone model,manufacturer and provider) but rather only 3g and test there and come back to us or disable hspa in hidden settings (phone control/nas control/hspa control/choose r99 hspa off),which should disable hspa/hsdpa and hsupa and test and come back to us. That should give you data while 3g symbol is lit at reduced speed of course.
Right now all you seem to notice that when you engage data it is h+ and when it falls back to 3g, the symbol is only for voice over 3g therefore no data arrows.
Yeah, I'm talking about when I'm I'm an area that has poor hspa coverage and it drops back to 3g. Btw, my old xperia had no problem getting hspa in these same areas, so my radio performance is generally pretty bad with the sgs2.
Try all the I9100T modems until you find one that works well for you; they do generally work better with the I9100T than I9100 modems. And if that doesn't work, then you might as well try all the I9100 modems.
I've got an I9100T & found there's 2 or 3 I9100T specific modems that I get great signal strength/data speeds with (and granted 1 I9100 modem), and the rest are ordinary for me.
There is no simple fix for this. It's a trial and error thing. Unless you want to spend hours on the phone to your telco for probably zero result ?
LethalCorpse said:
Yeah, I'm talking about when I'm I'm an area that has poor hspa coverage and it drops back to 3g. Btw, my old xperia had no problem getting hspa in these same areas, so my radio performance is generally pretty bad with the sgs2.
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Click to collapse
Threw me off, because of mentioning 'fast dormancy'.
Good that I apologized in advance then.
I would still recommend testing it the second way I suggested just to see whether it works at all. I also sometime end up in an area that while seeming to have full strong signal, due to a congestion at a peak and other factors, has no or very little data throughoutput (this being in canada).
As suggested by others, testing other modems may help as well.
Don't even get me started with sgs2 and nokia's regarding radio.

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