The MetroPCS BYOD kit is designed to be used to activate unlocked GSM smartphones (Android, iPhone and Windows Phone) on the MetroPCS network. This kit contains a nano SIM card as well as standard and micro SIM adapters to fit any compatible smartphone. If you are unsure which SIM fits your phone, please call 888-8metro8 before removing the SIM from the packaging. For devices using standard SIMs, install the nano SIM using the (larger) standard adapter. For devices using the smaller micro SIM, insert the nano SIM into the included micro SIM adapter. For newer devices using the nano SIM format, simply install the provided nano SIM and retain the unused adapters for future use. Once the correct SIM is installed, insert your phone's battery and charge your phone.