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2. List of countries by number of mobile numbers in use

   en.wikipedia.org/wiki/List_of_countries_by...

   It is common for each SIM card has a separate phone number, so phones with multiple SIM cards will have multiple phone numbers. As another caveat, some mobile phone numbers may be used by machines as a modem, such as intrusion detection systems, home automation, or leak detection, and some numbers may be used as a local micro-cell.

3. Regional lockout - Wikipedia

   en.wikipedia.org/wiki/Regional_lockout

   A spokesperson clarified the policy, stating that it was intended to prevent grey-market reselling, and that it only applied to the first SIM card inserted. [41] For devices to use a SIM card from other regions, one of the following actions totaling five minutes or longer in length must first be performed with the SIM card from the local region:

4. SIM lock - Wikipedia

   en.wikipedia.org/wiki/SIM_lock

   Japan's Ministry of Internal Affairs and Communications has legislated that all smartphones and tablets released after May 1, 2015, by NTT DoCoMo, au/Okinawa Cellular and SoftBank Mobile (the three major carriers in Japan) must be sold without a SIM lock upon request from customers and without any cost to the customer involved. Before that ...

5. SIM card - Wikipedia

   en.wikipedia.org/wiki/SIM_card

   A typical SIM card (mini-SIM with micro-SIM cutout) A SIM (Subscriber Identity Module) card is an integrated circuit (IC) intended to securely store an international mobile subscriber identity (IMSI) number and its related key, which are used to identify and authenticate subscribers on mobile telephone devices (such as mobile phones and laptops).

6. Roaming SIM - Wikipedia

   en.wikipedia.org/wiki/Roaming_SIM

   Some providers achieve this automatic call interception and callback by encoding a program onto the SIM card. Other providers use Multi-IMSI (International Mobile Subscriber Identity) technology to lower the cost of roaming. In this case, there is a program on the SIM card that selects the lowest cost IMSI (or 'profile') to use in a specific ...

7. Mobile number portability - Wikipedia

   en.wikipedia.org/wiki/Mobile_number_portability

   Up to 8 working days Free MNP can take up to 8 working days but usually takes no longer than 1–2 working days. Switching occurs between 1 am and 5 am. Peru: 2010.01.01 7–9 Free sim card of the new mobile company that will cost around 15 PEN. United States: 2003.11.24 0 Free