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Unknown Caller ID for Contacts.

James_A
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All my Incoming calls are Unknown, which includes Contacts stored on phone. 

I have caller ID and Spam protection turned on. 
I have reset Phone on numerous occasions, problem still remains.
This problem arose when I changed my Sim card to a new one. Believing the new sim to be faulty I got a new one, to encounter the same Issue.
My number has not changed since I first contracted with O2.

Any suggestions on how to resolve this matter would be appreciated. 

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O2Sarah-
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Thanks for the tag @MI5 

@James_A I will send you a private message so we can check your account. 

View solution in original post

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pgn
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Take your phone and photo id to an O2 store, a replacement SIM has fixed this recently for another customer here. Good luck, don't let the cowboys in store sell you anything either, @James_A 

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James_A
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Thank You for responding PGN, 
My previous sim encountered this problem. This is the second sim card that has encountered the same issue. 
Why would 2 brand new sim cards encounter the same Unknown caller ID issue for all Incoming calls?





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MI5
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@James_A 

Try turning off wifi and 4g calling in phone settings to see if it helps?

I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
Please select the post that helped you best and mark as the solution. This helps other members in resolving their issues faster. Thank you.
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James_A
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Thank You for the suggestion MI5,
Turned off 4G calling (wi-fi calling was already off), reset phone and still same issue. 

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MI5
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@James_A 

I'll ask @O2Sarah- to check in with you in the morning.

May need CLID resetting on your account.

I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
Please select the post that helped you best and mark as the solution. This helps other members in resolving their issues faster. Thank you.
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James_A
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Many Thanks MI5.

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O2Sarah-
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Thanks for the tag @MI5 

@James_A I will send you a private message so we can check your account. 

Message 8 of 11
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Woody45
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Hi having same issue on sony Experia since getting new O2 simcard after switching from virgin ,tried everything  .

Message 9 of 11
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Bartosz-88
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Hi , I got the same issue . All calls come as unknown and it’s affecting my business . Need to get this sorted asap . Please someone help me 

Message 10 of 11
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