on 22-08-2019 14:07
We always recommend you shop and go for the network that gives you what you require in terms of usage and network coverage
on 22-08-2019 14:23
Well there are better deals out there so shop around. Make sure that any chosen network gives you good coverage in your travelling ciircles though. O2 don't do loyalty I'm afraid.
on 23-08-2019 09:28
Comparison websites are also very good to see what deals you can get.
But as mentioned by both @PhoneChanger and @jonsie, make sure that whatever network you choose gives signal in your most visited places.