Ok up until a couple of months ago, I had perfect singal indoors at home and it is just getting worse and worse!
To the point, tonight, I am on emergency calls only!
I am already being massively overcharged for the package I am on, and now I can't make a call or receive one, which me being carer to my elderly dad, is no good at all and completely unacceptable!
I don't understand why it has changed so drastically! WiFi calling isn't available on my handset either, so that's not an option apparently!
Check for issues here O2 Service Status
and see this help Guide: How can I sort out my network issues?