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

Michael Shiloh michael at openmoko.org
Tue Mar 11 07:20:10 CET 2008


Ian,

I checked the map, and I'm in the same situation as you: 1900 and 850.

But I notice the maps are not maintained by the providers. How do we 
know they are up to date?

Michael

ian douglas wrote:
> 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.
> 
> 
> GSMWorld.com states that T-Mobile only uses 1900MHz:
> http://www.gsmworld.com/roaming/gsminfo/net_uswe.shtml
> 
> ... and that AT&T uses 850/1900:
> http://www.gsmworld.com/roaming/gsminfo/net_usb3.shtml
> 
> 
> And since the Neo cannot operate at 850MHz, it means I'm only using 
> 1900MHz.
> 
> -id
> 
> 
> 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
>>>>
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>>>
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