A satellite telephone is a telephone without cables whose base transceiver station (BTS) is in the air so that it can cover a wider area than a cellular telephone (GSM) whose BTS is on land. 

A satellite telephone will be the best solution for communicating in areas where telecommunication facilities are not yet available. Satellite telephones make and receive calls via satellite in outer space. From the satellite, it will be connected to the nearest gateway with the receiving telephone on earth, and vice versa.

The satellite telephone sends a radio signal to the satellite which is then transmitted back to the ground station which will route the call to the Public Switched Telephone Network (PSTN) or a GSM tower depending on the destination/recipient. In some cases, the satellite telephone provider will transmit from one satellite to another that has a connection to the ground station closest to the receiver.

Today’s satellite telephones features have almost the same features as today’s cell phones.

• Just like cell phones, satellite telephones use a SIM card and offer a variety of features. The handheld satellite telephone is battery-operated. 
• GSM compatibility allows the telephone to be used as a cellular phone.
• GPS displays longitude and latitude.
• Solar panel for remote battery charging.
• Paging, data transmission, and fax capabilities.
• Some satellite telephones are designed to be robust, shock resistant, waterproof, and explosion-proof.
• It has the same number and doesn’t change according to the SIM card used.
• Does not require any setup installation.
• It has the same number and doesn’t change according to the SIM card used.
• Does not require any setup installation.