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Details for US SIM Recommend Because the watch itself needs 2G network. If you use the watch at U.S, then just "Speedtalk" Sim Card can be used as watch sim card. You can order the SIM card from speedtalkmobile official website, recommend to choose "Kids plan" or "GPS Tracker plan" start at $5/monthly, it includes 100minute call and 100 MB Data and 100 Texts. No limit for parent cellphone services, att or other carriers will be ok. But for the watch sim card itself, the watch just can use Speedtalk service. How to setup: 1. Activate the SIM card via your phone; 2. Turn the watch off first then insert the sim to watch; (Please note the chip angle when insert the sim) 3. Create an account in App "setracker",register choose North America; 4. Send APN codes via your phone Message app to watch; Please note via Phone Message App?Not Setracker?send the following txt message (case, spaces and commas are important!) to watch SIM. The different SIM Card you use, the different ""APN CODE"" will be sent!!! For Regular Speedtalk Phone sim card: pw,123456,apn,wholesale,,,310260# For Speedtalk IOT SIM card: pw,123456,apn,mobilenet,,,310260# 5. Test in App. Kindly Note: please check the 2G coverage near your house through. https://www.speedtalkmobile.com/coverageMap . If your near your house, no 2G coverage, then the watch can not work. Any concerns, you can contact us and we will help you to solve. via https://www.amazon.com/seller/palmtalkhome , Then click the Yellow Button: "Ask a question". We will respond within 24 hours.