Who knows the whole process of texting by mobile phone?

Short messages are converted into electromagnetic signals in mobile phones and sent to the nearest base station. If the target mobile phone is in the signal coverage area of the base station, it is directly sent to the target mobile phone. If not, it will reach the base station in the area where the target mobile phone is located through the transmission between base stations, and then it will be transmitted to the mobile phone by the base station.

If the object is GSM, a base station to a sending station can send the signal to the satellite, and then directly from the satellite to the mobile phone.

It should be like this. If it is not correct, it will be corrected later.