Nath - as I unerstand it, the only time you need to call vodafone is when the text says they will start to charge you. If what they charge you is over 10% of your previous bill I believe, you can then cancel you contract for free, no penalties and move to someone else.

If this is incorrect - please can someone comment but beleive thius is so based on this thread and that on moneysavinsgexpert.

I am going to force the issue by downloading 750mb a day and see what happens.

Scott