Hello, how to build a gsm environment? Two mobile phones can send text messages without relying on the operator.

GSM is a mobile communication system, which can also be said to be a communication system. In this communication system, our mobile phone is just a terminal (ME) used to receive and transmit wireless signals, but at the other end of the system, that is, the base station (BTS) also needs to receive and transmit wireless signals, otherwise our information cannot be transmitted or received through the medium.

In other words, terminals must have a base station (BTS) to communicate with each other, thus achieving the purpose of GSM communication.

But you can't build a GSM environment with only two mobile phones, because there is no base station (BTS).

Hehe, but it's not impossible to send text messages without relying on operators. If you don't use GSM communication, you can use Bluetooth communication, but the distance of Bluetooth transmission is not far, and the range of 100m is feasible. First of all, after the Bluetooth of two mobile phones is established, it is very simple to transfer files, so it can be used to send voice or text. But at present, there seems to be no software dedicated to real-time call and chat for Bluetooth users. In fact, the reason is very simple, just for the benefit, I don't want to do it. It doesn't matter If any eldest brother can find this software, it will be best! Do you know, Bedo? Bedo is located by Bluetooth)