I've just phoned tmobile about this and the representative seemed very confused about the change.

I've been told that my 1GB data allowance will be capped to 500MB, and this 500MB will only be counted towards actual downloading of files, so my web browsing will not be affected by this and will remain unlimited.

I tried to get across to him that my main use of the internet was downloading files, but he kept beating round the bush telling me that I will still have unlimited web browsing after I exceed the 500MB allowance; after explaining countless times about my internet usage, he admitted that this change to the FUP "will affect me, but not by much" (I disagree).

I asked if I was able to terminate my contract (because of the changes, and the fact I have not received 30days notification), but I was told no.

He did offer my a £5 credit to my account which I refused just in case this was some sort of 'agreement' between us that I will be accepting their new changes.