Signal really poor

[Signal7]

Why has the o2 signal gone really poor ?

[pgn]

Guide: How can I sort out my network issues? 

And check if it is network or phone related by swapping your SIM into a different phone, and vice versa, @Signal7 

Then take a minute to download and set this up for places you frequent: 

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

Sometimes switching your phone from 5G to 4G or even 3G at times can help get better data download performance if the network is busy where you are. Good luck!