Unblock a person

Hello Ronilk.

Thanks for reaching out to Apple Support Communities. See the steps below to unblock a caller:

"From the Phone app, tap Recents, then tap the Info button  next to the phone number or contact that you want to block. Scroll down, then tap UnBlock this Caller."

Block phone numbers, contacts, and emails on your iPhone, iPad, or iPod touch

Cheers.