hey i bought an iphone in february, and brought it in to an apple store (along with my funky mbp) and casually mentioned some 'fuzzy' and quiet call problems while he was checking out my lappy. he looked up the serial number and told me it was part of a 'defective series' and exchanged it for me on the spot. i was browsing these forums and noticed that refurb phones have a serial number starting with '5k' so i checked my new phone... sure enough, it's a refurb. should i return it for a new one, since i paid for a new one? or is this something they usually do? thanks.