4G availability

[Trevor844]

I have lost access to my 4G. 

[Enlli]

Do you mean data or 4G Signal. Either way check these guides

Guide: How can I sort out my network issues? 

Guide: Is the network down for me or everyone? 

If that does not help you may need to contact O2

Guide: How to find help & contact O2 

[Oxonian]

This might also be useful @Trevor844 :-

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

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