Network support: GSM 850/900/1800/1900MHz, can work worldwide. It is necessary to use a GSM supported Sim card such as Metro-PCS, Lycamobile, Speedtalk, Ting GSM, Simple Mobile or any other operator that provides GSM Sim cards. Not applicable to AT&T (AT&T no longer supports GSM as of 2018) and any CDMA carriers such as Verizon, Sprint, Boost, PagePlus. Pen Mini Bluetooth Phone - It's not just a ballpoint pen that can be used for writing, it's also a mini phone. As a Bluetooth dialer, you can sync contacts and answer calls when paired with a smartphone via Bluetooth. It can also get music from Bluetooth devices and enjoy music through wireless control. Backup Phone - When you insert the nano SIM card, it can be used as a standalone phone or a backup phone, you can give it to your kids when they need it to go to school, or take this mini phone with you wherever you go, convenient for traveling and driving . It has a lower radiation rate than other regular smartphones, making it ideal for staying away from signal radiation. Multifunctional - This mini phone can be used as a camera to record your life and work. It can be used as a flashlight to bring you long-lasting lighting when you spend the night outdoors. Its FM radio function gives you clear broadcast enjoyment. It is also a useful device for your lectures, meetings, interviews, presentations and courses. Easy control - Long press "0" to enter Bluetooth mode. After pairing with the device, you can answer calls and listen to music. The 300mAh battery capacity provides up to 5 hours of talk time. Press and hold the "Up Button" to turn on the flashlight and charge your phone via Micro USB when the battery is low. Packing list: 1 x mini mobile pen