I am currently (and always have been) a Verizon customer. I recently purchased the HTC Incredible, but plan on trying out the EVO 4G. I hear that Sprint has great reception in Chicago, but I won't know until I actually try using the phone. Here's my question: Can I purchase the EVO 4G without canceling my Verizon plan, then test both phones for 3 weeks, before making a final decision? If, I decide to drop Verizon, can I then port my personal mobile phone number to Sprint, even though I've been using a newly-assigned mobile number on Sprint for three weeks? ** The reason I want to hang onto Verizon while I purchase the EVO 4G is that I want to make sure I can go back to Verizon if Sprint does not provide enough coverage.