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

ian douglas ian.douglas at
Tue Mar 11 08:59:55 CET 2008

Michael Shiloh wrote:
> 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?
"The US T-Mobile network predominately uses the GSM/GPRS 1900 MHz 
(this page also says T-Mobile uses 900/1800 in Europe)

The key word being 'predominately' of course, but doesn't back it up 
with what else it does use, otherwise the author should have used the 
word 'exclusively'. A little more digging found this:
"T-Mobile USA has ... roaming arrangements with ... AT&T Mobility ... 
predominately provided service using the GSM 850 MHz band"

So by that account, T-Mobile is 850/1900. I clipped out the other 
carriers partnered with T-Mobile, and other irrelevant bits.

The wiki page for AT&T Mobility only mentions in passing that it uses 
1900 as part of an initial joint communications project with T-Mobile, 
but says nothing of 850/900/1800, however we can see from the above 
statement of T-Mobile piggy-backing on AT&T's 850 network that AT&T 
*must* use 850, which backs up documentation that I've seen that says 
AT&T *only* uses 850/1900 in North America. There was one post I saw 
that claimed AT&T used 900 in New York City but couldn't find any 
additional documentation to back that up.

The wiki page for GSM usage in North America:

... simply points back to

Again, where we see AT&T uses 850/1900, and T-Mobile uses 1900.

Is there a way to tell on the Neo which frequency band it's currently 
using? That might be kind of handy...


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