so i just bought my first iphone in june off of craigslist for 325. it was in ok condition with dents on the top corners....so i was having problems with the battery lasting only 3 hrs on a full charge. and constantly freezing.. so i take it to an apple store. luckily the phone all of a sudden b4 my appointment the said iphone started making the sleep sound...i tried everyhtinh to make it stop. but i couldnt do anything....the apple genius looked at it and he said it could easily be restored.....but i was explainng to him that my biggest issue was the battery...so i told him that 3 hrs of battery life was unacceptable....he gave in and finally asked me "what would u like us to do so that you can walk out of here a happy customer" and i told him i wanted it exchanged. and he did. i was amazed at the service i got. even though they did resist for a while they gave in and gave me a brand new iphone. im happy... i love apple!