Thus, whenever one buys a mobile phone, he has to choose any of these four modes to get the necessary service from the chosen service provider
. In case of contract deals, it is compulsory for users to sign a contract with the chosen service provider. On the other hand, pay as you go and SIM free phones can be availed without any restriction from a particular service provider. In simple words, you are free to choose and to switch service providers as per your choice and requirement.