no signal

[robert_Johnston]

the signal service to my sim card suddenly disappeared and i havnt been able to use my phone since 6am 

[jonsie]

You need to contact customer service

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 using the links below, they should be able to help you with this
or give them a call on 202 or 0344 809 0202

Guide: How to find help & contact O2 

check these links for help:

Guide: How can I sort out my network issues? 

Guide: Is the network down for me or everyone? 

[Oxonian]

This app is referenced @robert_Johnston in the guides already provided to you :- 

My Network App - Find Out More About Your Network Coverage | Apps | O2

https://www.o2.co.uk/apps/my-network

I recommend giving it a try as it is really effective :-

Understand your network coverage

With the My Network app you can keep an eye on your coverage, wherever you are. Download the app and you’ll be able to:

- check the status of our network in your area – you don’t even need to enter your postcode
- test your network speeds
- report any issues with your service.

It’s simple to use and means that you can check the network without having to visit the main site or even enter a postcode.