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When the MSC gets the call, it checks its database for the location of the phone. Then it picks a frequency pair the phone will use in that cell to take the call. The MSC communicates with the phone over the control channel to tell it which frequencies to use, and once the phone and the tower switch on those frequencies, the call is connected.
If the phones were not locked, users might sign a contract with one company, get the discounted phone, then stop paying the monthly bill (thus breaking the contract) and start using the phone on another network or even sell the phone for a profit. [2] SIM locking curbs this by prohibiting change of network (using a new SIM).
Verizon is an American wireless network operator that previously operated as a separate division of Verizon Communications under the name Verizon Wireless.In a 2019 reorganization, Verizon moved the wireless products and services into the divisions Verizon Consumer and Verizon Business, and stopped using the Verizon Wireless name.
Verizon CEO Hans Vestberg said in a recent interview with CNBC that its current customer holds on to their phone for "way over 36 months," compared to in the past, when it was normal to change a ...
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If the wrong PUK is entered ten times in a row, the SIM card will become permanently blocked and unrecoverable, requiring a replacement or, in rare cases, can be recovered by the provider when the PUK code is forgotten. Mobile phone users are therefore advised by most providers to keep their PUK written down in a safe place separate from the ...
For example, one switch might send only the last four or five digits of a telephone number. In one case, seven digit numbers were preceded by a digit 1 or 2 to differentiate between two area codes or office codes, (a two-digit-per-call savings). This improved revenue per trunk and reduced the number of digit receivers needed in a switch.