Signal says No Connection

[NoConnection]

I've come back to the UK after a weekend away and my signal says "O2 No Signal". I have not been able to access data. 

[pgn]

Restart the phone and search manually for networks to pick up O2.

Also check Guide: How can I sort out my network issues? @NoConnection 

[NoConnection]

I have already done this and it did not work

[pgn]

Is there a service issue close to where you are, @NoConnection?

Otherwise, a call to O2 either on 202 or 4445, or via the Social Media Team at the relevant platforms in the link just below is needed.