Switching between prepaid SIM cards is very easy. Find your preferred service provider and begin the sign-up process. But before that, ensure you have consumed your balance.
Are you thinking of porting your current number? If yes, then inform your provider that you want to port your number to the preferred network, and order a SIM.
Your new service provider will port your number and send you the new SIM. Activate it by following the procedure of the specific provider and enjoy your preferred connection. While activating the SIM, you might be asked for valid ID proof. So keep it ready with you to avoid any delay in SIM activation.