International Mobile Termination Charge (IMTC)
International Mobile Termination Charge is an additional per minute rate that is applied to all international calls (direct dial calls from your home or business and calling card calls) originating in the United States and terminating in certain countries to either wireless communications devices, including but not limited to mobile phones, pagers, personal computers and personal digital assistants, or to a portable telephone number where a forwarding, tracking or other type of location service is used. These fees also apply to ranges of telephone numbers for special services as designated by the foreign telephone administration; such special services may or may not be wireless, and they may be for adult entertainment purposes. Many telecommunications companies outside the United States impose substantial fees to complete these telephone calls. In order to recover these fees, a mobile termination charge will be applied. The charge amount varies by country.
A complete chart outlining countries and rates is available from this link.