I've been experiencing terrible network coverage wherever I go in the UK for almost a year now. I've been in to my local O2 store multiple times to have this issue resolved, yet nothing has been done. My device has been checked for any issues, none what so ever. I've replaced the SIM and even swapped SIMs with a friend who is with EE. After putting the EE SIM in my phone, and them having my O2 SIM, they experienced terrible signal and mine was absolutely fine. I've been aware for a year now that my local mast is down, and I get told every time it's being sorted ASAP. At this rate, it seems like this is never going to be resolved! I shouldn't be paying a monthly fee for a product that is not fit for purpose! After talking to O2 customer services, they do not seem to care!