CNPGD Smart Watch + Watch Cell Phone Mobile Touch Screen Mp3/4 for Iphone and Android Phone Insert GSM Standard Size Sim Card (please note this watch is NOT WATERPROOF) AT&T, T-Mobile and All other GSM carriers Sim Cards are OK Verizon, Sprint NOT OK, other NOT GSM Carriers NOT OK MP3 / MP4 player / World time / Calendar / To to list / Alarm clock/ Calculator/ Stopwatch Small and comfortable to take and use