[toots66]

Note that it's selected tariffs only on Voda, 02 & T-mobile although some people have got the 3 tariffs (generally the best value) by phoning up and asking to leave; normal customer services cannot offer equivalents of 3 and, of course, you have to be out of the original 12 month contract to leave. They'll put you through to retentions who might be able to offer you a better deal.

You say you use less than 1/2 hour crossnet per day but that could still be quite a lot of minutes in total. As a comparison, £30 on 3 buys you 500 crossnet and 100 texts a month.