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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 the countries within the North American Numbering Plan (the United States and its territories, Canada, and much of the Caribbean), in which mobile phones are assigned subscriber numbers within geographic area codes, and are not easily distinguishable from landlines.
Many people, especially in the North American Numbering Plan (NANP), are not aware of the fact that calls to international mobile numbers are usually charged a much higher rate compared to calls to regular landline telephone numbers. For example: a popular international calling provider lists the following rates for calls from the United States to the United Kingdom: 2.5 cents/min for calls to UK landlines, and 19.3 cents/min for calls to all UK mobile subscribers.
The reason for this is cost sharing. In the United States, a caller to a cellular phone pays for the call, and the cellular phone owner - unless they have a plan that gives them unlimited minutes - is also charged for the minutes of cell time used for the call. In countries where there are high costs to call cellular phones, it is because the caller pays both the call cost and the cell minute cost, and the recipient is not charged.
Basically there are two types of numbering plans in connection with this issue:

• plans that don't differentiate between fixed and mobile numbers, such as the NANP
• plans with different area codes/prefixes for mobile and fixed line numbers.

The main difference between the two types of telephone plans is the "calling party pays" mobile network found in countries using the latter. In other words, the person being called wouldn't be charged for receiving calls on his mobile phone. The calling person pays a higher rate than when calling a landline number.