It's conceivable that you've banned someone's number if you've only missed calls from particular phone numbers or if someone says they contacted you but there's no record of their call on your iPhone. Follow these procedures to see whether any phone numbers are banned on your iPhone 7:

• 1From the Home screen, tap Settings.
• Toggle the phone.
• Select Call Blocking & Identification from the drop-down menu.
• After that, you'll get a screen with all of the phone numbers you've blacklisted.
• To unblock a phone number, go to Edit, then press the red circle on the left side of the number, then tap Unblock.