Is this a possible sync solution??
Let me preface this by saying that I can't DEFINITIVELY confirm this as a fix but it seems to have worked for me and my wife. There could be other factors that I'm not thinking of though. But essentially, the idea is that you turn off T-Mo syncing when both background data AND auto-sync are on. I think this causes the phone to actually "register" the T-Mo getting turned off, rather than still operating underneath your OFF controls. Then you turn back off the sync settings.
- In Accounts and Sync, check ON Background data and Auto-sync, if they're not on.
- Go into T-Mobile and UNCHECK Sync Contacts
- Go back to and UNCHECK Auto-sync.
If you now look at the T-Mo settings, there will no longer be a check box OR a sync icon and while the icons themselves probably have nothing to do with it, it would appear that the phone is no longer even offering the OPTION to sync T-Mobile. Again, I can't say this is a definitive fix for the problem, but since doing this, I haven't seen the syncing icon. And since doing this to my wife's phone, hers has gone from syncing all the time to not at all. And needless to say, battery life has improved.
I'd love to see if it DOESN'T work for someone. Just so that we can rule this out if it's not really a solution.