When I called to cancel with Three around 16 months ago they offered me a
minimum contract where the average cost per month was £17.50. It wasn't
straight forward as it was based on credits and goodness knows what to
average out at this figure for the duration of the contract.

What happens at the end of 18 months do they put it up to the £35 per month
or will they start charging a net £17.50 per month.

Don't make it easy do they?

Ken