Apltch Original No.1 D6 1.63" 320320 Sapphire Lens Smart Watch Phone Android 5.1 Smartwatch Heart Rate Monitor Barometer Support SIM Card WIFI GPS 3G Google Play (Golden) Frequency: GSM 850/900/1800/1900MHz;WCDMA 850/2100MHz Functions: GPS/WiFi/G-Sensor,Googl Play,Facebook,Heart rate measurement,Message,Pedometer,Health Tracker,Barometer,Voice Search,Alarm,Browser CPU: MTK6580 Quad Core 1.3GHz;GPU: Mali-400MP System: Android 5.1;RAM+ROM: 1GB + 8GB ;Memory card: Support TF Card 32GB MAX 2G Network is for all the phone services but for 3G,you need to check its frequency information below to confirm it with your local service carrier. 3G won't work in US but it will work on European area.