How you block a number depends on the type of phone you have.
The following covers the most two common devices. If you don’t see your device below, please contact your device manufacturer for how to block a call.
I have an iPhone
To block or unblock a number:
Find the call you wish to block
Tap ( i )
Scroll down to Block this Caller (or Unblock this Caller if they're already blocked)
Choose Block/Unblock this Caller
I use Android OS
Blocking a contact on your Android phone depends on your device, please contact your device manufacturer.