I think their kind offer to put people on 30 day rolling contracts is more for their benefit than ours. I do think they've seen they can get away with significant price rises and Ofcom not raising an eyebrow. To do this, you need to be out of contract (obviously if they've provided a handset it's different, but on SIM-only they can do what they like).
Why do annual RPI increases when you can just discontinue a tariff and put people on a new one that is 10, 20, 50 or 100% more?
Now Sky is putting up prices for customers who have just ordered Sky Q and may not even have it installed yet.. but already they're being told the prices advertised at launch are going up in June!
Why aren't our regulators looking at this and saying 'woah, hang on a minute'.
I know that in the case of Three, their get out is that you're free to leave, but if the same policy was adopted for everything then we could end up having car insurance that doubles part way through a year (but, no worries, you can just cancel your policy and be uninsured instead) and the same for gas, electric, water rates...
I see no reason for Three to dig out plans they had in 2013 (namely 4GB personal hotspot) which then went to 8 and then 12, and offer those to people who want a discount. It's not a discount then is it? It's a different plan! A discount would be money off the plan you've been offered.