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  2. Wi-Fi calling - Wikipedia

    en.wikipedia.org/wiki/Wi-fi_calling

    Wi-Fi calling, also called VoWiFi, [1] refers to mobile phone voice calls and data that are made over IP networks using Wi-Fi, instead of the cell towers provided by cellular networks. [2] Using this feature, compatible handsets are able to route regular cellular calls through a wireless LAN (Wi-Fi) network with broadband Internet , while ...

  3. eSIM - Wikipedia

    en.wikipedia.org/wiki/ESIM

    If the phone is stolen, it can be tracked by "find my phone" services, while a physical SIM can be removed. [34] The risk of damaging a SIM socket's delicate contacts inserting and removing a SIM is eliminated. Phones with eSIM only do not need to be built with hardware SIM holders or means to insert them.

  4. Emergency telephone number - Wikipedia

    en.wikipedia.org/wiki/Emergency_telephone_number

    This means that a traveller visiting a foreign country does not have to know the local emergency numbers. The mobile phone and the SIM card have a preprogrammed list of emergency numbers. When the user tries to set up a call using an emergency number known by a GSM or 3G phone, the special emergency call setup takes place. The actual number is ...

  5. 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).

  6. Direct inward dial - Wikipedia

    en.wikipedia.org/wiki/Direct_inward_dial

    A few US DIDs are available without monthly charges from vendors like IPKall (discontinued in 2016), but at the expense of the caller paying for a call to some expensive, rural location. The majority of vendors charge a nominal amount per number per month (as little as $1/month in small quantities) and then bill per-minute or per number of ...

  7. Telephone card - Wikipedia

    en.wikipedia.org/wiki/Telephone_card

    A telephone card, calling card or phone card for short, is a credit card-size plastic or paper card used to pay for telephone services (often international or long-distance calling). It is not necessary to have the physical card except with a stored-value system; knowledge of the access telephone number to dial and the PIN is sufficient.

  8. Prepaid telephone call - Wikipedia

    en.wikipedia.org/wiki/Prepaid_telephone_call

    Prepaid telephone calls are a popular way of making telephone calls which allow the caller to control spending without making a commitment with the telephone company. Prepaid phone cards are provided by various telecom companies. When you purchase a prepaid phone card, you are paying for long distance connection time in advance.

  9. IMSI-catcher - Wikipedia

    en.wikipedia.org/wiki/IMSI-catcher

    Depending on the signal strength of the IMSI-catcher, numerous IMSIs can be located. The problem is to find out the right one. All mobile phones in the area covered by the catcher have no access to the network. Incoming and outgoing calls cannot be patched through for these subscribers. Only the observed person has an indirect connection.