Ok so I recently returned the iPhone 4 and just bought a Captivate at Walmart for $150 because Android obviously pwns iOS4. The phone itself is amazing; I couldn't ask for more functionality in a cell phone! Anyway I have noticed the phone isn't working as it should becuase it restarts at random (I haven't rooted it or modified it in any way) and the WiFi antenna is obviously defective because it always has a weak signal and times out a lot (even when I am 1 ft away from the router lol). So I need to exchange the phone obviously, but I was wondering if it would mess up my plan in any way. I was hoping that they would just take the defective phone and hand me a new box and I can put my old sim card in it with all my contacts. Will it be this easy or will they have to mess up my plan and make me eligible for a new upgrade like when I returned the iPhone? Thanks for any help/advice!