First: Make sure that it's talking to the T-Mobile network. Dial *22899 to re-load the nearest tower to your phone. You can check your local coverage at http://www.t-mobile.com/coverage/pcc.aspx to be sure that you HAVE coverage. Don't try to use it near large metal objects (no phone will work there) or objects that use lots of electrical current.

If you're still having problems, you can call T-Mobile at 1-800-937-8997.

Good luck!