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Why doesn't the Droid 2 Global work on AT&T?

While I have no desire to actually use my Droid 2 Global on AT&T, I do intend to use it with foreign SIM cards when I travel abroad, and I would like to be certain that they will work. So I'm curious what is preventing the Droid 2 Global from working on AT&T, just in case that same issue would prevent me from using foreign SIM cards as well.

AT&T uses the 850/1900 MHz bands for GSM; the D2G supports 850/900/1800/1900.

AT&T uses the 850/1900 MHz bands for 3G (UMTS); the D2G supports 850/1900/2100.

Also, I have successfully unlocked the SIM using an unlock code I received from Verizon Global Support.

Anyone have an idea what the problem could be? There are several others as well who have mentioned this problem on various boards:

http://www.droidforums.net/forum/droid-2-global/96596-droid-2-global-unlock-foreign-sim.html#post990830

http://forum.xda-developers.com/showthread.php?t=838259

http://www.howardforums.com/showthread.php/1678591-Motorola-DROID-2-Global-Release-Thread?p=14119524#post14119524

Comments

MPhotox2

Since most GSM cellular networks outside the US use 900/1800/2100 Mhz bands, my guess is that even though it's "unlocked" there are restrictions to prevent you from using the 850/1900MHz band that TMobile USA and ATT use.

SGMD1

That's what I would suspect as well, which if true is pretty slimy of VZW/Motorola since both their sites advertise the phone as Quadband GSM and Triband UMTS. It's false advertising essentially.

Spiral

Are you trying to use your Droid 2 Global on the AT&T network while it is still active on the Verizon CDMA network? I believe this would be the cause of your problem, a network conflict with CDMA winning out.

SGMD1

No, the device has a menu to switch between Global, CDMA, and GSM modes.

SGMD1

Looks like this will require a radio firmware reflash to unrestrict the 850/1900 GSM/UMTS bands according to firebrain at xdadevelopers.

It has been done for WinMo phones so hopefully someone will be able to develop an Android solution as well.

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