How to Unblock Verification Codes on iPhone

Steps for iPhone Users On the Home Screen, select Settings. Within settings select Messages. Select the (-) sign beside the 5 Digit verification number on the blocked list and choose unblocked.
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Are you having trouble receiving your iPhone verification code? It can be frustrating when you’re waiting for an important message and it just won’t come through. Fortunately, there are some quick and easy fixes you can try to get your verification code back on track.

First, make sure your phone’s Do Not Disturb setting is turned off. This can be found by sliding down from the top of your screen and checking to see if the half-moon icon is lit up. If it is, toggle it off. This setting can reject incoming text messages, including verification codes.

If your code still isn’t coming through, check your phone’s settings. Go to Settings > Messages and make sure that iMessage and Send as SMS are both turned on. If Send as SMS is off, toggle it back on. This is important because some applications, such as Snapchat or Facebook, may send verification codes as SMS rather than iMessage.

Finally, check to see if Filter Unknown Senders is turned on. If it is, turn it off. This setting can filter out messages from people who are not saved in your contacts, including verification codes from applications.

Once you’ve made these changes, close out of the application and restart it. You should now be able to receive your verification code. If you have any questions or comments, let us know in the comments section below.

FAQ

How do I allow my iPhone to receive verification codes?
Sign in with your Apple ID and password on a new device or browser. Look for a sign in notification on any of your trusted devices. Tap Allow to receive your verification code. Enter the verification code on your other device to complete sign in.
Read more on support.apple.com
Why is my iPhone not receiving verification codes?
Turn Airplane Mode On/ Off If you have network issues at the place you requested the verification code, it might not come within the expected time. Therefore, turning airplane mode on/ off works like rocket science here. Just re-establishing the signal increases your chances of receiving text messages.
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How do I unblock short codes on my iPhone?
The number sending these messages is blocked. Make sure the number sending these verification codes isn't blocked by going into your Settings >, Messages >, Blocked Contacts. You'll be able to unblock the number from there.
Read more on forums.att.com