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We offer lifetime technical support for you,if you have any problem,feel free to contact with us via Amazon Support.You can always come to us for free customer service at:https://www.amazon.com/seller/zqtech-Ask questionsMore watch choiceSIM RecommendYou need to buy a SIM Card separately, we recommend SpeedTalk Mobile Card in US.Recommend to open $5/month plan, included 100 min Call / 100 MB / 100 SMSYou can search ""SpeedTalk Mobile"" on Amazon. T-mobile has too much plan that we can't ensure each of the plan can be compatible with our gps tracker watch.Don't support AT&T,Sprint, Verizon network format."How to set up?1.Activated the sim via your phone2.Please turn off watch before inserting the sim to watch3.Created a account in App ""setracker"",registered choose North America4.Send APN codes via your phone Message app to watch5.Test in AppMore Details in Manual. If you meet DEVICE OFFLINE,please contact us! Product SpecificationsProduct Name: smart watch PhoneMaterial: plastic and siliconeWaterproof: YESLanguages: EnglishGSM: 850/900/1800/1900 quad bandLBS base station positioning accuracy: 0.3~4 milesBattery capacity: 400MA, Standby: 100 h"Package1 x Kids Smart Watch1 x USB Magnetic charging cable1 x User Manual with After service1 x Cute Package