They are not Cell phones, cell phones have sim card. They are VoIP (Voice over IP Wikipedia the free encyclopedia) phones. They use WiFi or LTE conection to communicate with main server and and through it to the other servers.
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They are not Cell phones, cell phones have sim card. They are VoIP (Voice over IP Wikipedia the free encyclopedia) phones. They use WiFi or LTE conection to communicate with main server and and through it to the other servers.