Calls and messages without GSM or WiFi, or school disaster

Calls and messages, without GSM or wifi As you know, for two phones to get in touch, we need a cellular network or Wi-Fi internet connection. But what do we do in the event of a natural disaster, when mobile networks and the internet no longer exist? Or maybe we want to communicate with the phones connected directly to the school. Fortunately, there are communication solutions ... [Read more...]