yes i did, as soon as i got back with the replacement i restored from previous (original) iphone 4 backup made earlier that day. however the first iphone 4 i got, i didn't do a restore. proximity sensor issue was there too (which prompted the need for an exchange).
Initially, problem appears to be fixed. I can hold the phone around an inch away from my face, at varying angles, while the screen remains disabled. Before, any cradling of my phone / shoulder would make the screen active, but now it remains disabled.
Just tested against a co-workers by placing on a flat table and moving fingers to cover up the sensor... mine seems to work consistently within about an inch of cover-up, his is hit-or-miss even while physically covering / pressing on the sensor.
nice. what steps did you take? did you do a reset and delete all settings on the device? when you say "restore from original instead of from backup", what do you mean by "original"? do you do both steps (reset on device, then some restore from itunes?)
