Question for those of you for whom I've done a GSM firmware upgrade

Michael Shiloh michael at
Tue Mar 11 06:10:19 CET 2008

Do you know offhand what bands are used by TMobile and AT&T in your area?


ian douglas wrote:
> If it helps any, using the March 4th daily build, my Neo registers just 
> fine on both my TMobile and AT&T SIM's and both receive SMS messages and 
> can place phone calls.
> Mind you, I can connect to TMobile from within my apartment to 
> make/receive a phone call and receive SMS messages. Inserting my AT&T 
> SIM, I connected enough to download SMS messages, but to make a phone 
> call I had to go outside where I have better AT&T reception. Must be the 
> layout of the building where I live.
> -id
> Michael Shiloh wrote:
>> Hello,
>> As most of you know, there was a bug in earlier GSM firmware on Neo 
>> 1973 which prevented certain AT&T 3G SIM cards from working in the Neo 
>> 1973.
>> As most of you know, the upgraded GSM firmware that fixed this problem 
>> could only be installed by an employee of Openmoko.
>> I peformed this upgrade for perhaps a couple dozen of you.
>> After I upgraded the firmware on your phones I tested them with my 
>> personal AT&T SIM card, and they always worked fine.
>> Starting a few months ago my AT&T SIM card no longer works in upgraded 
>> Neos.
>> We're trying to get to the bottom of this. Meanwhile, a useful point 
>> of information would be your experience:
>> For those of you for whom I performed the GSM firmware upgrade, did 
>> the Neo 1973 work properly with your AT&T SIM card after the upgrade? 
>> Most of you wrote me when you received the phones to indicate that it 
>> did. Does it continue to do so? If not, when did this start happening? 
>> What are the symptoms?
>> For the larger community, do any of you have insight into cellphone 
>> tower technology? Has AT&T performed an update in the past few months?
>> Is it possible that AT&T has modified its policy towards unlocked phones?
>> These are all extreme notions - it is far more likely that something 
>> trivial and local has occurred. Perhaps I've forgotten to do something 
>> (although I've reviewed my steps in excrutiating detail with the folks 
>> back home) during the upgrade process. But since I'm completely out of 
>> ideas, I'm reaching to the less plausible.
>> Any ideas welcome, including crackpot ideas. To paraphrase Sherlock 
>> Holmes, when you have removed the possibility of all other causes, the 
>> one remaining explanation, no matter how implausible, must be the one.
>> Michael
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