@ nice
dear PTA assigns codes to the mobile companies like 0333, 0300, 0321, 0345. these codes are assigned to differentiate the number as we have area codes for land line numbers.
the subscribers limit for aparticular code is 5 million and as you know in pakistan past few years cellular density has rised so when company reaches the limit of 5 million it request PTA to assign another code to serve new potential 5 million customers.
hope i have answered ur queries
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