Although I like the flexibility of the plans on the AT&T Tab, I have 2 nagging issues. #1. Anyone been able to register theirs? Samsung.com/register does not recognize my IMEI as a valid IMEI number and will not let me register. #2. Side loading apps. I have the wonder side loading machine or whatever it is called, but I guess I cannot fund the correct USB drivers since the device is never recognized. AT&T blocking non-market apps on the Tab is a little frustrating. Thanks.