Network Support: GSM 850/900/1800/1900MHz, Can Work Worldwide. Must use the Sim card Which Supports GSM,Like Metro-PCS, Lycamobile, Speedtalk, Ting GSM, Simple Mobile Or Any Other Carrier That Provide GSM Sim Card . Will NOT Work With AT&T(Since 2018,AT&T Nolonger Supports GSM) And Any CDMA Carriers Like 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, when you use it paired with your smart phone through Bluetooth, then you can sync contacts and receive phone calling .It can also get music from bluetooth device, enjoy music by wireless control.Back up Phone - When you insert your nano SIM card, it can be used as an independent phone or your back up phone, you can give it to your teenagers when they go to school, or bring this mini phone to anywhere and portable for travelling and driving. It has lower radiation rate than other regular smartphones and is an ideal choice to stay away from signal radiation.Multi-functional - This mini phone can be used as a camera to record your life and work. When you spend the night outdoors, it can be used as a flashlight to bring you long-lasting lighting. Its FM radio function gives you clear broadcast enjoyment. It is also a useful device for your lectures, conferences, interviews, presentations and classes.Easy Control - Long press "0" to enter Bluetooth mode, after pairing your device, you can answer phone calls and enjoy music, 300mAh battery capacity provides up to 5hrs of talk time. Long press "UP Button" turn on the flashlight, and charge the phone with Micro USB when the battery is low.