To Unblock contacts on HTC One, do as follows:
1. Open "People" App
2. Tap the 3 dot icon on the top right and select "Manage Accounts"
3. Tap "Blocked Contacts" to manage black list
4. There you should see the list of blocked contact
5. Tap and hold on the contact you want to unblock
6. Select "Unblock Contacts"
7. Tap "OK"
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