Satellite phone and Cellular phones are wireless devices. They
almost look alike. But the way they work is totally different.
Cellular phones working method is cell based. That is why they
are called cellular phones. The whole network area is divided
into small areas. And in each area an antenna is installed.
These are also called towers. When a cellular phone is moving,
it keeps entering from one cell to another. When it crosses the
border of one cell, the phone sends a signal to the MTSO (Mobile
Telephone Switching Office). With the help of control channel
the database of the MTSO relocates the phone in a new cell or
area. The MTSO and Public Switched Telephone Network (PSTN)
coordinate to handle cellular calls.
But in the contrary Satellite phones use Low Earth Orbiting
(LEO) satellites. With the turning on of the satellite phone a
signal goes up to the any number of satellites of a group with
whom the phone is registered. When a person makes a call from
the handset, a signal goes to the near by
orbiting satellite.
The satellite connects to the gateway or ground station. Then
the gateway takes the call to the destination. The call can be
directed to the landline, cellular phone or PSTN. Any of the
landlines, cell phone or PSTN can also call a satellite phone.
In the case of satellite phones the gateway takes care of calls
not cells as in the case of cellular phones. If a satellite
phone calls another satellite phone, the call reaches a ground
station through a satellite. Then it goes up to the air to a
satellite and then the call reaches the destination phone. So
the gateway processes the switching of calls not the satellite.
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