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2. Local number portability - Wikipedia

   en.wikipedia.org/wiki/Local_number_portability

   The user wakes up using a new SIM-card from the new cell provider while keeping the number. In the mature Spanish cell phone market (as of June 2007, with 107 lines per 100 inhabitants [49]), portability has been widely used by the competing carriers as a way to steal each other's customers, usually offering them free handsets or extra credit.

3. Mobile number portability - Wikipedia

   en.wikipedia.org/wiki/Mobile_number_portability

   A key technical aspect of Mobile Number Portability (MNP) involves the routing of calls or mobile messages (SMS, MMS) to a number once it has been ported.Various call routing implementations exist globally, but the International and European best practice employs a central database (CDB) of ported numbers.

4. Telephone numbers in Iran - Wikipedia

   en.wikipedia.org/wiki/Telephone_numbers_in_Iran

   If you intend to use your SIM card, make sure to put your phone on flight mode after using SIM cards from Iranian companies. Irancell, Hamrah Aval and RighTel are the main 3 phone operators in Iran. Fortunately the existing mobile network provides 4G & 5G cellular data coverage in all the small and big cities around the country.

5. Who still owns a landline phone? You might be surprised at ...

   www.aol.com/still-owns-landline-phone-might...

   There are still some older alarm systems that require a landline phone line.” Closeup of male hand holding telephone receiver while dialing a telephone number to make a call using a black ...

6. Still love your landline? Phone service providers are getting ...

   www.aol.com/finance/still-love-landline-phone...

   More people who are still using telephone landlines will soon need to decide if they want to finally hang up on their service. Just last week, AT&T applied for a waiver that would allow it to stop ...

7. List of mobile virtual network operators in the United States

   en.wikipedia.org/wiki/List_of_mobile_virtual...

   Providers supporting multiple host networks use only one of them for each device, depending on the specific phone model and/or SIM card used (except for Google Fi Wireless, which switches automatically between the different listed host networks based on factors such as relative signal strength). [4]