Terrible signal

[Jamie13]

I have terrible signal !

[PhoneChanger]

Have you checked status.o2.co.uk to see if there is any work being done in your area?

[Bambino]

@Jamie13 The link to the advice from @PhoneChanger is within this link, as well as other suggestions:

How can I sort out my network issues? - o2uk

Edit: If none of that helps, you might want to consider getting a phone capable of WiFi calling, or if your phone is already capable of that you would need customer service to enable it for you on their end.