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Thread: If I use an AT&T sim in a T-mobile phone, will I get 3G speeds or edge?

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    If I use an AT&T sim in a T-mobile phone, will I get 3G speeds or edge?

    I was thinking of getting ST, but I want to buy a g2 or g2x, but those phones are for Tmobile.
    I here you only get EDGE on tmobile sims, so I want to know if I get a AT&T sim and stick it in
    my g2x, will it even work? will I get 3G?

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    With an ATT sim and an LG G2X you will also only get edge. If you get a T mobile sim you might have a better connection when you travel.

    Sent from my Xoom using Tapatalk 2

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    T-Mobile and AT&T use different frequencies for 3G. With the exception of high end penta band phones, a T-Mobile phone will never get 3G with an AT&T SIM and vice-versa. The G2 is a 3G T-Mobile phone so you should get 3G with the T-Mo SIM providede T-Mo has 3G coverage in your area.

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    Quote Originally Posted by oldnoob View Post
    T-Mobile and AT&T use different frequencies for 3G. With the exception of high end penta band phones, a T-Mobile phone will never get 3G with an AT&T SIM and vice-versa. The G2 is a 3G T-Mobile phone so you should get 3G with the T-Mo SIM providede T-Mo has 3G coverage in your area.
    Not never, just not usually. Some Samsungs are able to. Not all high end either...

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    you say high end penta. I have a low end penta - actually 6 band (tmo Prism)
    2G Network GSM 850 / 900 / 1800 / 1900
    3G Network HSDPA 850 / 1700 / 1900 / 2100

    3G/4G Capable
    GSM 850, 900, 1800, 1900
    Band II (1900), Band IV(1700/2100), Band V (850)

    Wondering how it would fare with a at&t sim?

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    Quote Originally Posted by curdean View Post
    Not never, just not usually. Some Samsungs are able to. Not all high end either...
    Quote Originally Posted by KrisM77 View Post
    you say high end penta. I have a low end penta - actually 6 band (tmo Prism)
    2G Network GSM 850 / 900 / 1800 / 1900
    3G Network HSDPA 850 / 1700 / 1900 / 2100

    3G/4G Capable
    GSM 850, 900, 1800, 1900
    Band II (1900), Band IV(1700/2100), Band V (850)

    Wondering how it would fare with a at&t sim?
    You're both right. Guess I should never say never.

    I should have been more clear, by pentaband I was referring to the 3G frequencies, not the standard GSM (2G) ones. Apparently there are lots more 3G multi frequency phones than the last time I looked into it. Most phones these days are multi frequency on the 2G side, so most unlocked GSM phones should get voice, SMS, MMS, and EDGE (2G) on virtually any GSM carrier with appropriate APN settings. On the 3G side AT&T uses 850 and 1900, T-Mobile uses 1700 and 2100, with 900 and 2100 being the most popular outside the US. So that Prism should get 3G on either T-Mo or AT&T.

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    Quote Originally Posted by oldnoob View Post
    So that Prism should get 3G on either T-Mo or AT&T.
    That was my hope when I bought it, as well as working with a European SIM.
    Moto Atrix HD: (fantastic reception) Younggun's HoloBlur X, and stock rooted JB
    Moto Atrix 4G: (great reception) M Montuori's Atrix-MROM 2013-03-30 (CM7.2)
    tmo SGS 4G (poor reception): bhundven's unnamed v1 (GB)
    tmo (Huawei U8651T) (good reception) Prism, CWM recov v4, CM 7.2 stable rom for U8650 Sonic

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    How about the HTC Amaze?

    Sent from my HTC Inspire on Straight Talk using HowardForums
    My Phone Can Amortize, Can Yours?

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    Or this phone:

    Samsung Galaxy W 679 Wonder 4G is an Android 2.3 Smartphone with a 3.7-inch touchscreen, 1GHz processor, 3MP camera, Bluetooth, Wi-Fi GPS and Memory card slot, additinal camera, organizer and multimedia players.

    I found this online for $199 new, seems like a nice low priced pentaband alternative to a ST branded phone.

    Anyone tried this phone on ST?

    Sent from my HTC Inspire on Straight Talk using HowardForums

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    Disclaimer: I have never seen, much less used either phone. By the specs it looks like either one will give you 3G on either an at&t or t-mobile sim. Don't know which carriers they are configured for, or how easy it would be to unlock those models.

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    Quote Originally Posted by oldnoob View Post
    You're both right. Guess I should never say never.

    I should have been more clear, by pentaband I was referring to the 3G frequencies, not the standard GSM (2G) ones. Apparently there are lots more 3G multi frequency phones than the last time I looked into it. Most phones these days are multi frequency on the 2G side, so most unlocked GSM phones should get voice, SMS, MMS, and EDGE (2G) on virtually any GSM carrier with appropriate APN settings. On the 3G side AT&T uses 850 and 1900, T-Mobile uses 1700 and 2100, with 900 and 2100 being the most popular outside the US. So that Prism should get 3G on either T-Mo or AT&T.
    Stop spreading the misleading information about T-Mobile using the 2100 MHz band. T- mobile uses Band IV, which is called the 1700 MHz band. In Europe they use the Band I, which is the 2100 MHz band. A European 2100 MHz band phone will not work on T-Mobile 3G nor will a T-Mobile 1700 MHz Band phone work on the European 2100 MHz band.
    As you can see from my reply elsewhere in this forum, the bands are different:
    http://www.howardforums.com/showthre...4#post14865504
    Earl F. Parrish

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    Here are the bands spec'd for that Samsung:


    GENERAL2G NetworkGSM 850/900/1800/1900
    3G NetworkHSDPA 850/900/1700/1900/2100

    Shouldn't it work for HSDPA on both ATT and T-Mobile? Also, I believe both phones I mentioned are sold unlocked.

    Sent from my HTC Inspire on Straight Talk using HowardForums

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    The problem is that the AT&T SIM card will force the phone to seek only the AT&T 3G bands. Since AT&T has no AWS service except for LTE, the 1700 MHz band will never be selected with an AT&T SIM card in the phone. In those areas where T-Mobile is using 1900 MHz for 3G, the phone will get 3G on the T-Mobile for voice only. This all goes out the window if AT&T has coverage in the same area as T-Mobile. There will be no roaming in that case. Additionally, Straight Talk usually does not allow data roaming when off the parent carrier network.

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    So, which bands are present on those phones such as the T-Mobile Prism, which people are reporting to receive 3g data on both ATT and T-Mobile sides of Straight Talk, while roaming one another?

    Sent from my HTC Inspire on Straight Talk using HowardForums

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    The Prism has
    7.2Mbps HSDPA support Edge,3G, / / HSPA Network HSPA 7.2 (I generally get about 5Mbps)
    Edge/2G (GSM/GPRS)

    3G/4G Capable<--- copied from somewhere. It is NOT 4G capable, nor HSPA+.
    GSM 850, 900, 1800, 1900
    Band II (1900), Band IV(1700/2100), Band V (850)

    I have no idea who has actually reported using both ST tmo and ST at&t.
    I am still on tmo.
    I read somewhere that tmo uses 2100 for d/l and 1700 for u/l or visa versa. But that doesn't make it true. Europe uses single band for both.
    Last edited by KrisM77; 07-16-2012 at 12:09 AM.

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