Unsuspending SIM cards can be achieved through SIAM. Unsuspending a SIM card makes it able to authenticate on the network again, and use available SIM services. It can only be achieved after the SIM card has been suspended for two hours.
To unsuspend multiple SIM cards see, How to bulk unsuspend SIM cards.
To terminate a SIM card (terminating a SIM stops the SIM card from authenticating on a network, and will incur cancellation costs if the SIM is still in contract) see, How to terminate a SIM card or How to bulk terminate SIM cards.
This is found at SIMS > SIMs List > Action > :
If successful the SIM Network Settings will appear:
If successful the SIM change state form will appear:
If successful the following message will appear: