On a mobile phone keypad, the letters ‘MNO’ are on which number button?
Prepaid mobile phone at which point, their service (and its associated phone number) is discontinued. The rules for when this deletion happens vary from operator to operator, but may typically occur after six months to a year of non-use. By 2003, the number of prepaid accounts grew past contract accounts, and by 2007, two thirds of all mobile phone accounts worldwide were prepaid accounts. The history of prepaid mobile phones begins in the 1990s, when larger markets were being sought after by the mobile phone operators. Before this date, all mobile phone services were offered on a post-paid basis, which excluded people with
Keypad Keypad A keypad is a set of buttons arranged in a block or "pad" which bear digits, symbols or alphabetical letters. Pads mostly containing numbers are called a numeric keypad. Numeric keypads are found on alphanumeric keyboards and on other devices which require mainly numeric input such as calculators, push-button telephones, vending machines, ATMs, Point of Sale devices, combination locks, and digital door locks. Many devices follow the E.161 standard for their arrangement. A computer keyboard usually has a small numeric keypad on the side, in addition to the other number keys on the top, but with a calculator-style arrangement