Been with T-Mobile for near 10yrs now, since they were one2one, and am seriously thinking about switching to another carrier - mainlly cos I want the new iPhone and as of yet, there doesn't seem to be a way to successfully unlock the sim restrictions to use a different carriers sim. Which sucks cos I'd love to use one with my T-Mobile sim as I get all the minutes/texts and free web access (3G) I want and it costs less per month than o2

I signed into another 18mth contract with them recently, not due to run out till Oct 09 - so whats the deal if I wanna cancel? Whats it gonna cost?