Choice 1: USE as Cell Phone(Sim Card Needed, See description for "Which Carrier OK")
Choice 2: USE as Smartwatch(NO Sim Card Needed, See description for Android & IPHONE SYNC, Some Function Blocked with no Sim Card and Memory Card)
IPHONE Partial Available, CAN NOT SYNC ALL(See desciption for Detail)
ANDROID Phone Can SYNC all(APP needed, See description for how to find APP)
Designed to charge by computer USB port, don't use other chargers, incorrect charge by other charger may hurt the battery. Don't heat battery or use in a hot condition(such as hot car in summer).
CNPGD [U.S. Warranty] All-in-1 Smartwatch Watch Cell Phone for iPhone Android Samsung Galaxy Note Nexus HTC Sony - B077SF6Y7R