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Calls not coming through and ringing

Bennet
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Phone not ringing, then text comes telling me that I have missed a call 

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jonsie
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MI5
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@Bennet 

Dialing this code will erase all call divert options on your SIM card.
  1. Open the Phone.
  2. Tap the Keypad.
  3. Enter the code: ##002#.
  4. Tap the Send/Call button.

Guide: All you need to know about O2 Voicemail 901 

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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jonsie
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@Bennet wrote:

Phone not ringing, then text comes telling me that I have missed a call 


Be aware though that some of these codes only work if wifi calling is disabled by customer service if you do have this

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