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How do I deactivate service on my phone?

My mom just bought me a Sprint HTC EVO Shift after breaking my other phone. The previous owners are going to try and deactivate the phone but if it doesn't work she's going to take it back to the previous owners, and I really like this phone so I don't want that to be happening. Is there any way to deactivate the service on the phone? Anything using the phone's service doesn't work at this point so I connected it to my WiFi so calling or texting doesn't work ATM but other things might work.

July 3, 2012