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2. 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).

3. 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 ...

4. Planning a trip to China can be confusing. Here are the ... - AOL

   www.aol.com/news/planning-trip-china-confusing...

   The doctor says she used a travel SIM card that came with a virtual private network (VPN) to access her usual mobile apps such as Google Translate. (More on this in the Q&A section below ...

5. International mobile subscriber identity - Wikipedia

   en.wikipedia.org/wiki/International_Mobile...

   For GSM, UMTS and LTE networks, this number was provisioned in the SIM card and for cdmaOne and CDMA2000 networks, in the phone directly or in the R-UIM card (the CDMA equivalent of the SIM card). Both cards have been superseded by the UICC. An IMSI is usually presented as a 15-digit number but can be shorter.

6. OneSimCard - Wikipedia

   en.wikipedia.org/wiki/OneSimCard

   OneSimCard's proprietary global travel SIM card [4] allows customers to call from anywhere in the world [5] without incurring additional roaming charges. [6] OneSimCard offers free incoming calls in over 160 countries, outgoing calls from 25 cents per minute and data service from 10 cents/MB.

7. eSIM - Wikipedia

   en.wikipedia.org/wiki/ESIM

   An eSIM (embedded SIM) is a form of SIM card that is embedded directly into a device as software installed onto a eUICC chip. First released in March 2016, eSIM is a global specification by the GSMA that enables remote SIM provisioning ; end-users can change mobile network operators without the need to physically swap a SIM from the device.

8. SIM lock - Wikipedia

   en.wikipedia.org/wiki/SIM_lock

   This is in contrast to a phone (retrospectively called SIM-free or unlocked) that does not impose any SIM restrictions. Generally phones can be locked to accept only SIM cards with certain International Mobile Subscriber Identities (IMSIs); IMSIs may be restricted by: Mobile country code (MCC; e.g., will only work with SIM issued in one country)

9. TravelSim - Wikipedia

   en.wikipedia.org/wiki/TravelSim

   TravelSim is a prepaid SIM card that provides telecommunications to clients in 190 countries. TravelSim has 3.5 million subscribers all over the world as of August 2013. [3] TravelSim has a callback service for voice communications, data, messaging and voicemail. [1]