How Does Mobile Phone Work!!!

Every one using  Mobile.  But are ever thought how does a Mobile Phone Work when we are connecting or connected to any one by call or  for Other thing. 

Still now I am telling about how does mobile work,

Before reading about this you need to consider some Picture

MS-Mobile System
BTS-Base Transceiver Station
BSC-Base Station Controller
MSC- Mobile Switching Center 
GMSC- Gateway Mobile Switching Center 
Database- Where store user details and all information about user.

Every one already Familiar with BTS Tower  which we easily  See in this environment. It emitte  radio-frequency waves .and It is a piece of equipment that facilitates wireless communication between user equipment(Mobile phones or etc. (UE) and a network.

Every User Have a SIM Subscriber identity module, By which user interact.

Mobile sent signal to the BTS Tower and and BTS send information for BSC after that BSC send the information to MSC and MSC Identify the user and check all information about that user eg. is balance available or not if Balance is available the they send the information to those BSC where User is Calling. and that BSC sent to your call to that phpne Using the BTS Tower.