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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