Originally Posted by jeffbichel
I tried to get the $15 (200 meg) data package to work, but there is no signal showing up on the phone. anyone got any ideas?
Any ATT data plan should work, but only with ATT's 2G service*.
there are a few things I could think of that could be causing your problem which are separated by phone or network problems (these are all assuming your phone is searching for signal and isn't giving you any obvious errors about the sim):
1. Your MT slide is locked to WCDMA only, which won't work on ATT (see explanation below*).
2. Your unlock method didn't work.
3. Any other random prob with your handset hardware/software.
1. You are not in a ATT 2G coverage area
3. You are in a location that the ATT 2G signal is being blocked.
2. There is an ATT network outage in your area.
The quickest way to narrow down your prob is to get a hold of an ATT phone that is working (either from a friend or an ATT store) and test your sim in that phone. that will tell you if you need to start troubleshooting your phone or your sim/att service.
*ATT uses a different frequency for their 3G coverage (ATT uses 1900 mhz and 850 mhz WCDMA as oppose to T-Mobiles 1700 mhz WCDMA). this means that if you locked your phone to WCDMA on the slide, then it is going to try to look for an ATT signal at 1700 mhz, which does not exist. Unfortunately there is no way to "re-tune" the radio hardware in most devices to operate on a different frequency, so your probably stuck with 2G only if you continue to use ATT.
the only exception that I know of is the blackberry bold 9700, in which the radio hardware actually supports all gsm/wcdma bands, and just has the "Carrier appropriate" bands enabled in the software. this may be the case with the MT slide, but I doubt it.