Fixed Mobile Substitution (FMS) is a technique related to Fixed Mobile Convergence (FMC) and Mobile to Mobile Convergence
(MMC). In Fixed Mobile Substitution, there is a substitution from fixed to mobile services. Mobile phones and smart phones are used to handle the telecommunication services that were previously handled by fixed phones. FMC concepts are offered by mobile network operators for the residential sector and are handled via femtocells
. In contrast, Fixed Mobile Convergence (FMC) offers two different mobile technologies.