This option is completely different from the other two options of contract deals and pay as you deals
. In contract deals customers need to sign a contract with the service providers for a specific period of time which can last up to 12 or 24 months. During this period of time users are not allowed to change the services and have to pay monthly bills. In pay as you go option you have to make advance payments and it totally works on your credit. Once your credit reaches zero you cannot avail the service anymore until and unless you get your phone topped up. These options are suitable to those who do not travel much and stick to one region only. But with sim only mobile offers neither you need to limit yourself into a contract nor you need to worry about changing to other service providers. Various network providers have this deal to offer to its customers. The users need to act wisely and compare all the deals available either on net or in market as you deserve the best.