Mobile telephony
（重定向自Cellular telephony）
![Mobile phone tower](/Images/godic/202501/03/Telstra_Mobile_Phone_Tower0733.jpg")
![Mobile phone subscriptions, not subscribers, per 100 inhabitants 1997-2007](/Images/godic/202501/03/Mobile_phone_subscribers_per_100_inhabitants_1997-2007_ITU0733.png")
![This Railfone found on some Amtrak trains in North America uses cellular technology.](/Images/godic/202501/03/Railfone0733.jpg")
![Cellular phones allow people to communicate from almost anywhere at their leisure.](/Images/godic/202501/03/2003-09-23_Convenience_of_a_cell_phone0734.jpg")
Mobile telephony is the provision of telephone services to phones which may move around freely rather than stay fixed in one location. Mobile phones connect to a terrestrial cellular network of base stations (cell sites), whereas satellite phones connect to orbiting satellites. Both networks are interconnected to the public switched telephone network (PSTN) to allow any phone in the world to be dialed.