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"?If you have any questions about the watch, please feel free to contact us in the following ways.‘’ ?Lsflair@outlook.com ?https://www.amazon.com/seller/Lsflair -Ask questions ?Compatibility The watch only supports 2G GSM nano sim cards with data and voice plans. Unlocked for worldwide use. ?Provide watches without SIM card. We recommend the operator: Speedtalk. ?How to set it up? ?1) Activate SIM card via mobile phone ?2) Insert the SIM card into the smart watch ??Check 2G Network Coverage?Before buying the watch, please first check on speedtalk Coverage Map,(https://www.speedtalkmobile.com/coverage) and confirm whether there is 2G network in your surroundings. Otherwise, the watch can not work when there is no 2G network.Only support Speetalk! (Not compatible with: Sprint, Verizon, AT&T, T mobile)