If I suspend my Dingtone phone number, can I renew it?

Yes, you can.

As you enable the “Suspend This Number” by tapping “Connect” >> “My Phone Numbers” >> Select a number >> Enable “Suspend This Number”, you can’t temporarily use it to make phone calls, send messages or to receive calls.

You can keep using it by disenabling “Suspend This Number” by following the above procedures. You’re allowed to renew it at any time.