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  2. STU-III - Wikipedia

    en.wikipedia.org/wiki/STU-III

    STU-III secure telephones on display at the National Cryptologic Museum in 2005.. Most STU-III units were built for use with what NSA calls Type 1 encryption.This allows them to protect conversations at all security classification levels up to Top Secret, with the maximum level permitted on a call being the lower clearance level of the two persons talking.

  3. 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.

  4. Prepaid telephone call - Wikipedia

    en.wikipedia.org/wiki/Prepaid_telephone_call

    Telephone prepaid calling cards (commonly known as Phone Cards in the US and the UK) are available from newsstands and drugstores. They are often the cheapest means of making long-distance or even international telephone calls. Moreover, they offer complete anonymity. Phone cards sold by retailers are live (active) when purchased by consumers.

  5. Subscriber trunk dialling - Wikipedia

    en.wikipedia.org/wiki/Subscriber_trunk_dialling

    Subscriber trunk dialling (STD), also known as subscriber toll dialing, is a telephone numbering plan feature and telecommunications technology in the United Kingdom and various Commonwealth countries for the dialling of trunk calls by telephone subscribers without the assistance of switchboard operators.

  6. How to make payments with your phone - AOL

    www.aol.com/finance/payments-phone-164336000.html

    Once your credit cards are set up within the app, you can begin using Samsung Pay to make credit card phone payments. First, open the Samsung Pay app on your phone. Confirm your identity by ...

  7. International call - Wikipedia

    en.wikipedia.org/wiki/International_call

    It can be made with the use of a telephone card, as described above. Telephone cards are typically sold in newsagents or can be purchased from the user's mobile phone using reverse SMS billing [7] It can be made by using a SIM card provided by mobile virtual network operators, which include UWTMobile, Lebara Mobile and LycaMobile.