Ordered my black online and returned it next day due to the proximity sensor. Never really had an issue with reception, but the replacement unit had an even worse sensor.
Went to apple last Friday again to look at sensor & battery. Tests came back normal abd that my 5.5hr usage fell within their acceptable range and would not replacement since the sensor fix was coming soon.
Went back to apple tues to return & said they couldn't accept an online order in store, so they setup the return with cs.
Sent it back this morning and awaiting my upgrade reset so I can order the white ...which I planned on getting the whole time. Apple just made it easier to justify doing it