 Fixed Mobile Substitution

Fixed Mobile Substitution, usually abbreviated to FMS, is the use of a mobile phone (cellular phone) instead of a fixed, wired, POTS 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 a fixed phone, 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.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).