Message not sent phone number formatted incorrectly

[OldCopperballs]

I recently switched to 02 from ID mobile and I ported my number across.  Ever since porting my number I can receive SMS messages but I can't send them!  I've tried different SMS apps and the result is always the same.....message not sent, phone number formatted incorrectly.  This happens to ALL my contacts.

I have tried force stopping the apps, clearing data and cachewith no success.

The message centre number is shown correctly for o2 pay monthly.

I don't know whether this is an issue with the port over or my phone, although everything worked fine before the port.

I have Xiamo redmi note 10 pro.  I have phone o2 but they've been of little help to resolve this.

[MI5]

@OldCopperballs 

Check the guide here Guide: Text Message Tips (not sent or received) 

We’re just customers like you but it sounds like you’ll need someone to access your account which can’t be done from here. If you message O2 on Facebook (https://o2uk.co/O2CFB) , Twitter (https://o2uk.co/O2CTW) or Instagram (https://o2uk.co/O2CIG) , they should be able to help you with this
Thanks

[Breanna]

Hi @OldCopperballs were you able to get in touch with O2 about this?