Millions of people around the world use cell phones, which were first invented in 1906 and allowed people to talk to anyone anywhere in the world. Cell phones have identification codes like S.I.D. that are used to identify the phone, owner, and service provider. When a S.I.D. code is sent to the FCC, they verify and match the code before sending an activation message, allowing the phone to connect to frequencies from MTSOs and establish two-way radio connections to other phones.

2. Around the world there are million of people use
cell phones.
The cell phones are the wonderful gadget from it
we can talk to anyone, anywhere in this planet.
The first cell phones is invented by Charles E.
Alden in year 1906.
a successful demonstration of a true, fully
functioning mobile phone was dated way back
1973, demonstrated by Martin Cooper of
Motorola Company.

6. All cell phones have special codes associated with them.
These codes are used to identify the phone, the phone's owner and the service
provider And that code called S.I.D.(system identification code).

7. When you send the S.I.D. code to FCC (Federal Communication Commission).
They verify the S.I.D code and they match both S.I.D. code and then send the
message of activation.

8. When the activation message come the cell phones catch frequencies from MTSO
(Mobile Telephone Switching Office) and keep check the frequencies from the
Database.

9. When the cell phone catch the frequencies then the cell phones are connected
To other cell phones this is called two way radio, connected to your friend.