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Know Before You Buy The SIM card operators supported by the watch in the US are: AT&T, Iowa Wireless, Cincinnati, Partnership, T-Mobile, WAP Cleartalk, Airadigm, Western, Inland Cellular, epc.tmobile.com, SunCom Wireless, Cingular.If you need to use another type of SIM card, you may need to reset the APN or encounter other failures. We will try our best to assist, but we cannot guarantee success. The watch's factory default IP is in North America. If you want to use it in other regions, you must reset the watch's IP. For detailed instructions, please refer to our user guide. There are 2 layers of protective film on the watch screen. Due to size design issues, some watches may appear to have bubbles on them.If you don't want to see its ugly appearance, you can choose to use tape or similar to remove the protective film on the surface. A smaller protective film is included in our package. Specifications Screen: 1.44 inch Touch color display ,Pixel 240*240 GPS Accuracy: 50m LBS Accuracy: 500m WIFI: Wireless 802.11 b/g/n Bluetooth: 4.2 Memory: RAM:2G; ROM:4G Location: LBS,GPS,AGPS,WIFI 2G Network: GSM B2/3/5/8 3G Network: WCDMA B1/2/5/8 4G Network: FDD-LTE:B1/2/3/4/5/7/8/12(or17)/20/28A SIM card: Nano SIM card Calling: 3 SOS + 10 phone number Camera: 0.3MP pixels SOS: Support Remote monitoring: Support Lithium battery: 650mAH Watch languages: English, German, French, Italian, Spanish, Turkish, Portuguese, Russian,Simplified Chinese, Traditional Chinese