Virgin use the EE/Orange/T-mobile network which has good coverage.
Freedom Pop uses Three.
Giffgaff is cheap (I pay either £5 or £7.50 a month for more than I need, I pay higher amount if I'm expecting more usage that month) but uses the O2 network which hasn't got brilliant coverage.
The further you are down the pay scale, the more 'essential' you are when the s--- hits the fan... Sue Farbysmith 2020
Insults are engendered from vulgar minds, like toadstools from a dunghill - Charles Caleb Colton
We don't do charity in Germany, We pay taxes. Charity is a failure of governments' responsibilities - Henning Wehn