Phone Not working - All signal lost

[REBECCA1980]

Hi, I upgraded my daughters phone last week and changed her number - today my phone and my second daughters phone have completely lost all signal and cannot make or receive calls every time I call customer service they say the same thing and then cut me off! I had the same problem last year when I upgraded the two phones that have now lost signal - last year it was some tech thing they had blocked on the lines but I cant remember what it is - any ideas?

So far I have been on the phone to them for 4 hours this morning- can anyone help

[REBECCA1980]

Can anyone tag an O2 GURU ? they were the only ones that managed to get it resolved last time.

[Bambino · Accepted solution]

@REBECCA1980 The O2 online advisors are no longer available.

You can message O2 on Social Media. Facebook (https://o2uk.co/O2CFB), Twitter (https://o2uk.co/O2CTW), or Instagram (https://o2uk.co/O2CIG) or give them a call on 0344 809 0202, 0800 902 0217 or 0800 032 1402. If you have no phone to use download Skype to call the freephone numbers: Guide: A Guide to Skype 
When it comes to the reason you are calling, stay silent for 15 seconds and you will be taken to the keypad options.
Press 2 for Everything Else
Press 5 for More Options
Press 7 for Anything Else which will put you though to someone.
Say 'Upgrade', 'Lost/Stolen', or 'Fraud' if the suggestion above doesn't get you through.
Best time to call is 8 am.