I have the £35 one. is that the flex-t your looking at?
Get £200 credit and can use it on what ever you want. Think I ended up paying £35 and thats with unlimited internet usage aswell. I only have 3 months left and unfortunately going to cancel but thats only beacuse i always use the internet and the best phone at the moment internet compatable was the iphone from what I've read so I now have that.
No-where near as good a deal but thats the price you pay I suppose. Is it just an upgrade you want or are you looking at T-Mobile generally?
If you just want to test it without getting into a 18 month contract you can take mine over for last 3 months if you like. I just leave it turned off now as everyone has my new number.