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A provider is a contractor of telecommunication and/or Internet services. By using DCalling you can complement the services of your telephone provider, e.g. for international phone calls or calls to mobile networks. We recommend simply comparing prices for calls with DCalling and with your own telephone provider. If you combine the tariff of your provider with an additional callthrough or callback service like DCalling, you can save up to 98% of the telephone costs for international phone calls and calls to other mobile phone networks. One of the most efficient ways to use DCalling is to use a local dial-in-number if you have a flat rate for national phone calls or the area code of our dial-in-number.