Unblock a number in your recent calls list
Just tap the “I” info button next to the number and scroll down to Block this Caller. Then tap Block Contact on the next screen. If you decide you want to unblock any numbers you've blocked, head over to Settings, then Phone, and Blocked Contacts. Inside you'll see all of the numbers you've blocked.
Luckily it is simple to do and basically all in one place. Head to Settings -> Phone -> Call Blocking & Identification and toggle off any call blocking software that is on.
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How to block and unblock Unknown Numbers:
The operator would ask the person you were calling to accept the charges and if he or she said okay, you're good to go. For the phone companies, connecting collect calls was a rather profitable business. (And to be clear, it still is — collect calls most definitely still exists.
If you would like to stop collect calls from a Pay Tel jail facility from coming into your phone number, please call 1-800-729-8355, press 1 for English (2 for Spanish), then enter your phone number with area code and follow the voice prompts to place a block on your number.
Unblock a Saved Number on iPhone On the “Contacts” screen that opens, find the contact that you want to unblock and tap it. Your selected contact's details page will open. Here, scroll down the page and tap “Unblock this Caller.” And your iPhone will immediately unblock the selected contact!
Calls and messages from that number are marked Blocked.Unmark a call, message, group message, or voicemail as spam
Question: Q: How can I unblock all of the numbers I have blocked?
What to Know
How to Unblock Incoming Private Calls