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2. SIM lock - Wikipedia

   en.wikipedia.org/wiki/SIM_lock

   A SIM lock, simlock, network lock, carrier lock or ( master) subsidy lock is a technical restriction built into GSM and CDMA [1] mobile phones by mobile phone manufacturers for use by service providers to restrict the use of these phones to specific countries and/or networks. This is in contrast to a phone (retrospectively called SIM-free or ...

3. Prepaid mobile phone - Wikipedia

   en.wikipedia.org/wiki/Prepaid_mobile_phone

   Prepaid mobile phone. A prepaid mobile device, also known as a pay-as-you-go ( PAYG ), pay-as-you-talk, pay and go, go-phone, prepay or burner phone, is a mobile device such as a phone for which credit is purchased in advance of service use. The purchased credit is used to pay for telecommunications services at the point the service is accessed ...

4. eSIM - Wikipedia

   en.wikipedia.org/wiki/ESIM

   Evolution of SIM cards. An eSIM is not removable. An eSIM (embedded SIM) is a form of SIM card that is embedded directly into a device. Instead of an integrated circuit located on a removable SIM card, typically made of PVC, an eSIM consists of software installed onto an eUICC chip permanently attached to a device.

5. SIM card - Wikipedia

   en.wikipedia.org/wiki/SIM_card

   SIM cards are identified on their individual operator networks by a unique international mobile subscriber identity (IMSI). Mobile network operators connect mobile phone calls and communicate with their market SIM cards using their IMSIs. The format is: The first three digits represent the Mobile country code (MCC).

6. OneSimCard - Wikipedia

   en.wikipedia.org/wiki/OneSimCard

   OneSimCard offers free incoming calls in over 160 countries, outgoing calls from 25 cents per minute and data service from 10 cents/MB. The SIM card is compatible with unlocked GSM phones and the main phone number, once the SIM card is inserted, is based in the EU.

7. Zong (mobile network) - Wikipedia

   en.wikipedia.org/wiki/Zong_(mobile_network)

   Zong. CMPak Limited [1] [2] ( Urdu: زونگ ), doing business under brand name Zong, is a Pakistan based mobile data network operator, owned by China Mobile. [3] It is the first overseas setup of China Mobile through acquisition of a license from Millicom to operate a GSM network in Pakistan in 2008. [4]