Since December 2016 I've been using Plusnet Mobile as my main network, but this week I've returned to PAYG network giffgaff.
Normally, I go with the best value option for my mobile needs, but Plusnet Mobile isn't it any longer - I have a dual sim phone and it's madness to ignore this fact.
So, I've ordered a good value data sim which I'll use to cover my main mobile needs, therefore virtually eliminating the need to buy a regular monthly plan just to get a monthly data allowance.
If you would like a free giffgaff sim with £5 of free credit, head on over to this link:
https://giffgaff.com/orders/affiliate/terran_federation?ggSMS=app