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  2. History of mobile phones - Wikipedia

    en.wikipedia.org/wiki/History_of_mobile_phones

    History of mobile phones. A man talks on his mobile phone while standing near a conventional telephone box, which stands empty. Enabling technology for mobile phones was first developed in the 1940s but it was not until the mid-1980s that they became widely available. By 2011, it was estimated in Britain that more calls were made using mobile ...

  3. North American Numbering Plan - Wikipedia

    en.wikipedia.org/wiki/North_American_Numbering_Plan

    International access. 011. List of dialing codes. The North American Numbering Plan (NANP) is a telephone numbering plan for twenty-five regions in twenty countries, primarily in North America and the Caribbean. This group is historically known as World Zone 1 and has the telephone country code 1. Some North American countries, most notably ...

  4. Cellphone overage charges - Wikipedia

    en.wikipedia.org/wiki/Cellphone_overage_charges

    In North America, this fee for the extra minutes is called overage fees or overage charges . For example, suppose that a mobile phone user signs up for a post-paid cell phone plan that costs $40 per month and is allowed a quota of 700 minutes under that plan. If this user were to end up using 750 minutes in a month, then they would be charged ...

  5. Cell phone's calculator saves you from the 'per-unit shaft' - AOL

    www.aol.com/news/2009-12-07-your-cell-phones...

    If you carry a cell phone, you also have a calculator. Pretty much every mobile phone on the market has one, so you have no excuse not to do some intelligent per-unit math while you're out shopping.

  6. Mobile phone - Wikipedia

    en.wikipedia.org/wiki/Mobile_phone

    Mobile phone. A mobile phone or cell phone[a] is a portable telephone that can make and receive calls over a radio frequency link while the user is moving within a telephone service area, as opposed to a fixed-location phone (landline phone). The radio frequency link establishes a connection to the switching systems of a mobile phone operator ...

  7. Operator assistance - Wikipedia

    en.wikipedia.org/wiki/Operator_assistance

    Operator assistance refers to service provided by a telephone operator to the calling party of a telephone call. This can include telephone calls made from pay phones, calls placed station-to-station, person-to-person, or collect, third-number calls, calls billed to credit cards, and certain international calls which cannot be dialed directly.

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