America what kind of cell phone
Since the cell membrane controls movement of materials in and out of the cell, I'd say the border police because they controls what comes in the country and out of the country.
When you have a cell phone that you are using in your country and you want to go to another country you have to apply at your cell phone company to roam your account to be able to use it in the other country
Yes - every country does !
China
CHINA
china
In what country?
Globe Telecom has 53 cell sites in the entire country as of june 1986.
The United States.
your face
The United States of America.