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  2. Telestial - Wikipedia

    en.wikipedia.org/wiki/Telestial

    This is the first time that local SIM cards were available to consumers in the US and around the world, for purchase outside their respective host countries. Telestial is an alternative to an expensive phone rental and convenient but expensive international roaming. In 2003, Telestial introduced the HopAbroad service for North American travelers.

  3. 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.

  4. 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.

  5. 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.)

  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. SIM card - Wikipedia

    en.wikipedia.org/wiki/SIM_card

    A typical SIM card (mini-SIM with micro-SIM cutout) A SIM card or SIM (Subscriber Identity Module) 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).