In many countries, mobile phones are assigned dedicated mobile phone codes within the country’s telephone numbering plan. Some countries that do not use area codes (e.g. Singapore) allocate specific number ranges to mobile phones that are easily distinguishable from landlines. One notable exception to this type of assignment is how the countries within the North American Numbering Plan (the United States and its territories, Canada, and much of the Caribbean) assign mobile phones subscriber numbers within geographic area codes by not being easily distinguishable from landlines.
A mobile phone prefix is the first set of digits of a telephone number; It shows which network the number is from.
Please remember that it is not possible to tell the current operator of a mobile phone from its number alone, as customers can take their numbers with them when they move between different phone networks. The table above shows only which company originally issued each range of numbers.