A:
Galaxy Gear is currently compatible with these Samsung smartphones.
AT&T: Samsung Galaxy Note 3 (SM-N900A), Samsung Galaxy S 4 (SGH-i337), Samsung Galaxy S III (SGH-i747), Samsung Galaxy Mega (SGH-i527)
Sprint: Samsung Galaxy Note 3 (SM-N900), Samsung Galaxy S 4 (SPH-L720), Samsung Galaxy Note II (SPH-L900), Samsung Galaxy S III (SPH-L710)
T-Mobile: Samsung Galaxy Note 3 (SM-N900T), Samsung Galaxy S 4 (SGH-M919), Samsung Galaxy S III (SGH-T999/T999L)
Verizon Wireless: Samsung Galaxy Note 3 (SM-N900V), Samsung Galaxy S 4 (SCH-i545)
U.S. Cellular: Samsung Galaxy Note 3 (SM-N900RA), Samsung Galaxy S 4 (SCH-R970), Samsung Galaxy Note II (SCH-R950), Samsung Galaxy S III (SCH-R530)