Re: I switched to a different phone on my no-contract plan, called customer service, got it all taken care of. Was told 2 hours before phone would work, it's been 4 and still have no service.

Hello!

We would be happy to assist with this! Have you been able to update your SIM card via your My T-Mobile account? If not, this may be useful (a step by step guide as to how to identify your SIM card number and how to activate/update it): http://support.t-mobile.com/docs/DOC-4677

Once updated, your device should be up and running within 2 hours! Please note, after updating the SIM card number, you may wish to powercycle your device (turn off, then turn back on).

Let us know if we may assist with anything else!

-Joshua J.