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Originally used mainly in the telecommunications market, today flat rates are available for many kinds of services or products. ### The various flat-rate tariffs of telecommunications providers The flat rate for phone calls can be limited to different types of use. While some flat rates include phone calls to all national networks, others may be restricted to calls within the fixed-line network or within certain mobile networks. Flat rates for unlimited international calls to certain countries or regions are also available. A flat rate for Internet access includes the Internet connection itself and the transfer of an unlimited volume of data. It is now common for some network providers to protect themselves against intensive use by reducing the maximum speed of data transfer for the remainder of the month once a certain monthly data volume has been exceeded. Even though, in this case, they are not offering a truly flat rate, the tariffs are still advertised as being exactly that. While these volume-limited flat rates are rather still rare with [DSL](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/sdsl-shdsl) or cable network connections, this tariff model is predominant with mobile phone networks. When using [Voice-over-IP telephony](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/voice-over-ip) it is important to be aware that various tariff models exist and that billing will be affected accordingly. As VoIP calls are transmitted over the Internet, users must be mindful that in addition to the cost of the phone calls, the Internet usage and data traffic volumes are also billed for. Therefore, in order to ensure that calls are not billed through two different tariffs, VoIP users are advised to opt for a flat rate Internet connection that has no volume limit. In this situation VoIP usage is only charged for on the applicable VoIP tariff. ### Related Articles ### Voice over Internet Protocol (VoIP) **What is VoIP?** The **Voice over Internet Protocol,** also called IP telephony, is a method of communication for making calls over a broadband Internet connection as an alternative to regular calls made over an analogue phone using the [PSTN](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/pstn). These VoIP calls can happen entirely over the Internet but where required, gateways also link to the PSTN. This means that VoIP users can still connect to anyone with a telephone number including local, mobile, and international numbers. VoIP services can be accessed from a computer with a so-called [softphone,](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/softphones) from an IP phone, from a smartphone or from a conventional landline phone that is connected to a VoIP adapter. 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