1. jetsetjoey's Avatar
    you listed 2100MHZ as a supported iPhone 4 frequency AND you listed 2100MHZ as a T-Mobile frequency, so WHY wouldn't it work?
    2011-08-25 07:21 AM
  2. i.Annie's Avatar
    Bc T-Mobile lacks the 1900 frequency. Both 1900 and 2100 are required. T-Mobile lacks one of them.
    2011-08-25 09:22 AM
  3. osito2789's Avatar
    Bc T-Mobile lacks the 1900 frequency. Both 1900 and 2100 are required. T-Mobile lacks one of them.
    They "Lack a frequency"? that doesn't make sense. They dont lack any frequency. They use the 1700Mhz instead. And its not cuz they choose to....

    Frequencies are Assigned by the FCC. and T-Mobile was assigned the 1700.
    2011-09-02 02:43 AM
  4. i.Annie's Avatar
    Not all cell carrier run on the same frequencies, as you've described. Lacking doesn't mean it's a bad thing, it just means it doesn't exist in a certain scenario such as this one.

    Technically it doesn't run on that frequency required by an iPhone to pick up 3G, my terminology is not wrong

    Edit: btw I'm not going to argue with you on this. My point was clear and you may feel you'd like to use different diction choice, to each his own
    2011-09-02 03:00 AM
  5. daytonaviolet's Avatar

    it been proven since the iphone 3G came out.. tmobile does NOT support any ATT 3G phones which use 1900 and 2100 mhz. for example, the T-Mobile G2X phone runs on 1700 and 2100 mhz for its 3G. but.. i wont work on ATT's 3G network as ATT only provides 1900 and 2100.
    2011-09-02 04:36 AM
  6. i.Annie's Avatar
    I think he gets that. He's just being nit-picky about my word choice. Perhaps if I had said "T-Mobile does not run both of the required frequencies the iPhone calls for" then it would've been more satisfactory.
    2011-09-02 06:09 AM
  7. Cheddarbob's Avatar
    Just to burst a bubble... I know this is an old thread and its only fun to beat a dead horse if you are me

    I have a Nokia N95 8Gb that i bought on ebay forever ago, its the euro version, it supports GSM/EDGE on 850, 900, 1800 and 1900, and HSPDA on 2100 only.. Guess what.... The 3g logo pops up on the phone with my tmobile sim card... But that is because tmobile uses HSDPA for their 4g network in the 2100 band in my area, The phone gets full speed and the 3g logo... sooooooo.... why is it that the iPhone that supports HSDPA on 2100 does not work on tmobile? My iphone 3gs only got edge, I just got my hands on an aussie iphone 4, and i want to see if it will work with tmobile's 3.5g network like it is technically capable of.

    So... If my nokia N95-2 from late 2007 will get 3.5g from T-Mobile with only the 2100 band supported for it... why cant the iPhone when it too supports HSDPA on 2100?

    Link to the n95 on gsm arena

    Nokia N95 8GB - Full phone specifications
    Last edited by Cheddarbob; 2011-11-04 at 06:46 AM. Reason: ad a link
    2011-11-04 06:45 AM
  8. i.Annie's Avatar
    The iPhone requires both 1900/2100. Reviewing some specs of T-Mobile phones, they don't require both 1900/2100 to work with 3G on T-Mobile.
    2011-11-04 05:02 PM
  9. r34p3rex's Avatar
    There is so much misinformation in this thread.. I feel like I need to set the record straight.

    First of all, a phone does not REQUIRE any bands. There is no intrinsic band REQUIREMENT. In order to connect to your carrier's network, you need to have the proper band support on your phone.

    AT&T uses 850/1900 for their GSM/2G/EDGE network. They also use 850/1900 for their 3G/4G HSPA network (and 700/1700Mhz for LTE). AT&T covers many of its areas with both 850 AND 1900 towers, but some markets work exclusively on 850 or on 1900 depending on what licenses they have in the market. Therefore, in order to get optimal coverage, you need a phone with BOTH 850 and 1900.

    T-Mobile uses 1900 exclusively for their GSM/2G/EDGE network. They use 1700/2100 for their 3G/4G HSPA network. BOTH 1700/2100 are required for the phone to operate as in 99% of their covered areas as 1700 is used for downlink and 2100 is used for uplink. If your phone only has 2100 but no 1700, sorry but you're NOT going to get any 3G data. You'll be able to request data on the 3G network, but there is no way for their towers to send you data via the 1700 band since your phone does NOT support 1700.

    The iPhone 4 supports the 4 standard GSM/2G/EDGE bands used world wide: 850, 900, 1800, 1900. Therefore GSM/2G/EDGE will work on T-Mobile. On the 3G side, the iPhone 4 supports 850/900/1900/2100. This is BUILT INTO THE HARDWARE. There is ABSOLUTELY ZERO possibility of changing the bands via a software mod. ABSOLUTELY ZERO CHANCE. If the hardware to support the 1700 band isn't there (antenna and chipset), how is software going to enable it? Unless you can somehow write software that can alter the chipset physically and synthesize a 1700 antenna out of nowhere (and if you could, you would be an instant billionaire, win a nobel prize, etc).
    2011-11-15 09:53 PM
  10. i.Annie's Avatar
    I wouldn't consider it misinformed. It just isn't in the technical detail you've set it in.

    But I thank you for the details, no need to dispute otherwise. I enjoyed your explanation.
    2011-11-15 11:29 PM
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