# Fixed mobile substitution

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{{Unreferenced|date=November 2020}}
'''Fixed mobile substitution''', usually abbreviated to '''FMS''', is the use of a [mobile phone](/source/mobile_phone) (cellular phone) instead of a fixed, wired, [POTS](/source/Plain_old_telephone_service) telephone.

Although strictly, this could simply be as the result of a subscriber making an individual choice (for example, "25% of the population of Finland do not have fixed phones, but use mobiles all the time, even at home"), the term is usually used to describe a deliberate tactic of a carrier to promote such a behavior.{{Citation needed|date=September 2017}}

One such technique is the use of "homezones" (where calls on a designated cell, covering the subscriber's home, are at a preferential tariff, or even free). Although very popular with subscribers, and delivering good uptake, these are expensive for carriers, and outside of a few specific countries (e.g. Germany with Genion and Zu Hause services) they are not common.

The use of [femtocell](/source/femtocell)s promises to be a more attractive (and potentially more profitable) approach.{{cn|date=September 2012}}

The term FMS is in contrast to [fixed mobile convergence (FMC)](/source/IP_Multimedia_Subsystem), which is usually used to describe the use of two different technologies (hence "convergence") to deliver a similar user experience. Examples include the use of dual-mode handsets with both cellular and [WiFi](/source/WiFi) technologies and hand-off between the two.

==References==
{{Reflist}}

Category:Telephony

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Adapted from the Wikipedia article [Fixed mobile substitution](https://en.wikipedia.org/wiki/Fixed_mobile_substitution) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Fixed_mobile_substitution?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.