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Discuss Theory to Practice: T-Mobile 3G on iPhone 3G at the iPhone 3G - Hackint0sh.org; ...
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    Lightbulb Theory to Practice: T-Mobile 3G on iPhone 3G

    For years the only apple device I've owned is an iPod Touch 2G. A while back I acquired a free, hand-me-down iPhone 3G but have not used it as my main phone for several reasons.

    Today, while stamping out stuck pixels on my iPod, the bright idea came to my mind: Why exactly can the iPhone not be used on T-Mobile USA's 3G network? (Called TMO3G henceforth to simplify)
    I spent the next 6 hours doing research with no concrete answers. Eventually, gathering the useful information that I had found I decided to discuss my theory and the possibility of a practical application for getting access to the TMO3G service on an iPhone 3G (or others by extension)

    The iPhone 3G gets its UMTS capabilities from a chip in its Logic board. Due to my limited knowledge on the matter I am not sure if it is from the murata or Infineon chip.
    However, I have gathered that it is most likely that either the chip is not capable of connecting to the band IV and I, as needed for TMO3G or Apple has restricted its capabilities and left out the IV band. If it is the latter, would it not be able to simply be "switched on" by a mod of the firmware?

    Surely, with today's higher understanding of the iPhone/iOS internals by the dev teams out there, a software hack would have surfaced if this was the case. This leads me to believe that the chip is not capable of band IV. A complication, but it seems to me that the fix would be to adquire a band IV-compatible chip from the original supplier (or a very compatible alternative) and replace the iPhone chip with the replacement along with possible firmware tweaks to handle the new frequency... OR a cover-up to trick the phone into thinking the new frequency is in fact the old one it used for 3G connectivity.

    What are your opinions on this approach? If anyone was confident in giving this a try and succeeding, I and many other people I know would be willing to fund the project.

    Possibly Helpful Links?

    UMTS frequency bands - Wikipedia, the free encyclopedia
    http://www.ubmtechinsights.com/uploa...Sample-BOM.pdf
    PHONE - ON - A - CHIPô - Infineon Technologies
    Apple iPhone 3GS 16GB - What's Inside_text - Electronic Products
    Under the Hood - Update: Apple iPhone 3G exposed



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    Super Moderator Array Olethros's Avatar

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    Even if the feature could be enabled in the Infineon baseband (which I doubt). There is no IV band power amplifier on this device, so the signal could not be amplified for transmission.
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    If that is the case, a replacement of an unused frequency chip would enable the amplification. Sure, it sounds far fetched in terms of replacements.. just a whole bunch of replacements that lead to a partially new phone that is limited or nearly limited to be used on T-Mobile USA. But I think that there are many people that would be willing to try such a mod to get proper, affordable, NOT LIMITED, data access from their phones.

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    Super Moderator Array Olethros's Avatar

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    Even then, the antenna may not be properly tuned for the 1700MHz frequency. Now that verizon has an iPhone, I don't doubt that if the multi-band chips are small enough and power efficient enough, then a properly t-mobile compatible iPhone will arrive soon enough. Apple needs to expand it's market share in the US, the only way it can do this is by offering the phone on more carriers.

    Rather than complain about the lack of support for t-mobile, lobby your government to ensure that such "virtual monopolies based on frequency allocation" aren't possible with the next generation of mobile tech. You didn't see this kind of "phone only supported on one carrier" problem in Europe or much of Asia where the governments have actually done their job and standardised frequency allocations properly.

    The US is such a backwards country when it comes to these things because they are too unregulated and suffer from the "not invented here" syndrome.
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    Hmmm that antenna issue might complicate things a tad. To be honest, I stopped waiting for Apple to do the logical thing and just release the iPhone across the board in the US. I happen to know for a fact that Apple will sell so many devices if it opens up that they will be back ordered for months. However, I am just here for studies so there really isn't much I can do to help out "such a backwards country". All I can do is try to help out on the small scale by trying to figure out a way to hack and modify the iPhone to get it to access the missing frequency. If, even remotely, there was at least a 70% chance of getting such a hack to work.. by either individually replacing the appropriate parts, or installing a extended antenna and processing board that sticks out the side of the phone, i'm sure even apple would benefit from the increased purchases of iphones for this purpose. Both in the short and long run.


 

 

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