This smart watch will only work with GSM networks: GSM 850/900/1800/1900MHz Unlocked for Worldwide use. Please ensure local area network is compatible. click here for Network Frequency of your country. Please check with your carrier/provider before purchasing this item. HEDY W06 Smartwatch Phone MTK6261 GPS Tracker SOS Button Anti-lost Support SIM Card Safety Monitoring Descriptions: SOS Emergency Button One button SOS, under stand by status, push for 3 seconds for calling, and will automatically send message to your emergency contact person in case the call cannot get through Pedometer Record the steps you take and count the distance to make you fully control your sports Safety area Alert will happen when the children are outside the Safety fence. Anti-lost Function If the watch is lost, the watch will send a message to parents' phone when someone insert a new SIM in the watch, then parents will know who is using the watch illegally Living Water Resistant Design Water resistant, do not worry when washing hands or wearing in the rainy day Tracker Real-time check the location of the watch Resolution ：960 x 320 pixl Standy Time: 5 days Band Length: 21.6cm Band Width: 1.55cm This watch is compatible with Android 4.0 and iOS 6.0 above. Please take the user manual for reference.