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

ian douglas ian.douglas at
Tue Mar 11 07:59:08 CET 2008

According to AT&T's map, zoomed in at my street address:

MODERATE: The areas shown in the light orange should have sufficient 
signal strength for on-street or in-the-open coverage, but may not have 
it for in-vehicle coverage or in-building coverage. This AT&T owned 
network provides GSM, GPRS, and EDGE service.

T-Mobile's site lists my address as a "2 bars" location saying I should 
be able to make calls outdoors, but likely not inside a building. states that T-Mobile only uses 1900MHz:

... and that AT&T uses 850/1900:

And since the Neo cannot operate at 850MHz, it means I'm only using 1900MHz.


Michael Shiloh wrote:
> Do you know offhand what bands are used by TMobile and AT&T in your area?
> Michael
> 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
>>> _______________________________________________
>>> OpenMoko community mailing list
>>> community at
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