Convert your iPhone or Android into a Dual SIM phone with this small credit card-sized device. Simply insert your 2nd SIM into the Duet and connect to your phone via Bluetooth. Works with locked & unlocked phones. Complimentary WorldSIM prepaid SIM with US$10 starter credit included keeping you connected in over 180 countries at low rates. WorldSIM Duet standby time is 80 hours and can be charged via micro USB (cable provided).