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Only getting edge speeds with straight talk t-mobile sim

post #1 of 32
Thread Starter 
I bought a phone that was blacklisted for ATT. Unlocked it to t mobile. Bought a t moble sim card from straight talk. Im only getting edge. How do I fix it to get 4G?
post #2 of 32
is it a 4g phone?

what are the bandwidths? if you bought a oversea phone, it might only use european 3g, such as 2100mhz

try going into mobile network settings and changing the network mode to "WCDMA only". If its on auto, might try to constantly go to edge.

from ST forums
Quote:
None of you complaining about speed are mentioning the device frequencies in your device. This is something you'd better learn about quick. Because if you're using an AT&T SIM, but your device does not have UMTS/3G frequenies 850MHz and 1900MHz, you'll never get beyond 2G speed. Regardless what any customer service rep tells you. And just because you see your device supports 850&1900 if it's only listing that for 2G and different numbers for UMTS/3G, you won't get 3G.

For T-Mobile 3G/4G, you need UMTS frequencies 1700MHz and 2100MHz. 1900MHz may work in just a few select areas.

Notice, where I'm saying you need X and Y, you need to have BOTH X and Y. So only having UMTS 850 but not 1900 also is not good enough for AT&T 3G. Just having UMTS 1900 and not 850 is not good enough for AT&T 3G. Having UMTS 2100 alone is not good enough for T-Mobile 3G/4/G.

The Straight Talk reps may say a 4G unlocked phone can get 4G with them, but that's only if your device has the correct frequencies. And the reps know about the needed 2G frequencies, but they're not as well versed on 3G/4G frequencies. You need to get the network SIM for the network that has the correct 3G frequencies for your device and you need to know exactly which frequencies your device supports. You need to know more than simply that you have a "4G" device. You need to learn all the frequencies in your device and compare with the network. And Straight Talk's site does not list the 3G/4G frequencies, so you need to read about those at a site that details AT&T/T-Mobile 3G/4G frequencies. Wikipedia is good for that.

Edited by king8654 - 12/14/12 at 2:26pm
     
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post #3 of 32
Thread Starter 
Of course. Samsung Galaxy SII.
post #4 of 32
Thread Starter 
I'm kind of lost.
post #5 of 32
supposedly the att samsung galaxy s3
Quote:
However, due to the radio frequency compatibility of this phone, you'll only get EDGE level data.
on other networks

keep finding this
Quote:
If you get a phone from AT&T and are able to get it unlocked, you can use on T-Mobile but will only get Edge (slow speed).

might be sol buddy thumbsdownsmileyanim.gif
Edited by king8654 - 12/14/12 at 2:57pm
     
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post #6 of 32
Thread Starter 
Alright well thanks looks like I am selling this phone.
post #7 of 32

You need a phone that supports the following to have full speed/technology capabilities with ATT & Tmobile on one device:

 

GSM - 800mhz, 1900mhz

UMTS/4G/HSDPA - 800mhz, 1900mhz, *2100mhz

LTE - 700mhz, 2100mhz

 

 The phone you have does not have the 2100mhz band.. therefore you only receive GSM/EDGE frequencies... Look for similar phone, just with 2100mhz capability for UMTS/HSDPA wink.gif

 

*HTC Vivid supports both.. and all of the above bands.. also comes S-off 90% of the time for retail sample

post #8 of 32
Thread Starter 
Is there a kernal I can load onto my phone that will unlock those frequencies?
post #9 of 32
Unfortinately. the ATT S2/i777 SUCKS compared to the rest, Even the int'l9100 only gets EDGE I believe. I guess you could say that the i777 is the bastard of the GSM S2's.

The Tmo T989 and ATT i727 Skyrocket will work if you are interested in S2 only. The Skyrocket is almost identical (the roms for both are interchangeable) to the T989 +ATT LTE. Best if used with a Tmo radio rom, which can be flashed very easy. Only downfall to the SR is sim unlock. Since it is an ATT "exclusive" they do not "have" any sim unlock codes. You can still sim unlock, but costs money. I did mine with freeunlocks.com I think their price is 25$ OR you can complete one of their offers which are cheaper alternatives.

If you are interested in a T-mo 4g phone I have a fact/warranty replacement T-mo Amaze 4g for sale.
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post #10 of 32
Quote:
Originally Posted by lowkickqop View Post

Is there a kernal I can load onto my phone that will unlock those frequencies?

 

No.. Kernel is like the instruction set for the OS.. this will not change or affect related frequencies.. only how the phone works [frequencies are related to the phones internal radio.. which can be flashed separately in some cases with limited results].

 

 What you need is a phone that supports 800/1900/2100 for UMTS/HSDPA .. then you will have full speed 4G with either ATT or TMO on the device.

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