Sounds like a Google thing. Very scary stuff.

My understanding of the problem is that even with Data Roaming disabled, sometimes your G1 thinks it is on its home network when it is actually roaming. Let’s assume you are a T-Mobile USA user. The problem occurs when your are on, say, the UK T-Mobile network. The G1 thinks it is your home network (because they are both T-Mo) and thus disabling Data Roaming has no effect.

There does seem to be a solution: Disable all data connections on your G1:

1. Use Anycut to create a shortcut to “Testing”
2. Click on Testing.
3. Click on Phone Information
4. Hit Menu button
5. Click on More
6. Click on Disable data connection

This turns off all data access. Note that GPRS service switches to “disconnected”. Now you should have a phone that does voice calls, but no data access.

[...] via G1 Data Always Connected = Roaming $$$ | Android Central [...]

Follow-up: After disabling the data connection, you can, of course, use your wifi without incurring data charges. However, when you turn off your wifi, your G1 will automatically re-enable the data connection. So, after you use wifi, don’t forget to re-disable your data connection.

THANKS LRRR IT WORKED =DD

I always get the message “com.android.phone crashed” when I click the testing link -> Phone information, but only if there is an active EDGE/GRPS connection. After that the sim is locked again and I have to input the PIN again… no way for me to turn off that stupid data connection? can’t believe it crashes for me and nobody else.

Thanks. Works and vastly improves battery life!

[...] I’ve decided to close the 2g-3g connection while I’m not using it, following the guidelines in this post, and now the data consumption and the battery levels behaviour is finally [...]

Thanks a lot, It was driving me crazy. But, why is the G1 always maintaining an open connection, either in your own network?