i read a lot of posts about people getting their iphones replaced for new ones because of problems theyve been facing. ive had a few problems with mine, but am waiting a few days to see if they have worked out after restarting the phone and resetting the network settings (as was told to do by the apple people). the problem ive been having is that at random times, the signal bars go to 0 bars and it says No Service. sometimes it goes back to 5 bars right away, but other times i have to restart the phone to fix it. im in areas where i should be receiving full signal strength. its happened quite a few times. if i go to the apple store, will they replace the phone for me? if they do, will it be a brand new phone or a refurbished one? thanks.