With numerous mobile phone network providers, you get a multitude of good reasons for switching your mobile provider. Switching mobile network is much easier than you think. It is also not necessary to cancel your existing service while changing the service provider.
Whenever you feel like changing your service provider, find your required plan and order a new SIM. If you like to port your existing number, mention it in your sign-up form. You can easily port your number by getting a PAC code. After receiving the PAC code, your only task is to provide that code to your new service provider, and this begins the process of changing your mobile service provider.
Your previous connection remains active, till the time the whole transfer process of mobile operator completes.