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Went to Portugal - phone stopped working. came back to UK - still not working

Level 1: Joiner
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Hi, I've been in portugal for the past week 24 - 31 May. On the 27th, my O2 connection stopped working. I tried switching the mobile data APN to solve the issue - nothing happened. I had to buy an eSIM from AirAlo for the week, as I could never get O2 back online. 


Landed this evening in London again, and my phone is still not working. I've reset the mobile network settings and performed the following:
* rebooted device 3-4 times

* reset network connection

* ensured i've got mobile data turned on

* ensured i'm up to date on my payments


the phone just says 'no service'. Any ideas?

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Level 94: Supreme
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O2 sim failure or phone failure of sim reader if physical sim.

Guide: Is the network down for me or everyone? 

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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