So I just received my iphone 4 and the proximity sensor is driving me nuts! I see that I can return within the 30 day period and the restocking fee will be waived. However, how does this affect the ETF of my new contract? Do I revert back to my old contract with my 3GS and be subjected to that ETF if I decide to cancel? Keep in mind that I am a year into my contract and I will more than likely cancel my service altogether and go with Verizon. Thanks in advance.