This is a reply email I just received from CS:
Thanks for your email Jordan, enquiring about the changes to the Internet Fair Use Policy from 3GB to 500MB.
I understand the importance of this matter and I'll be more than happy to help with your concern.
On the 1st of Feb 2011, we are changing our Internet portfolio and Internet fair use policies. As part of the changes, all existing Internet on Your Phone (web'n'walk) will have your fair use policies reduced to 500MB. When the changes come into effect, you will still get unlimited browsing and email, so only things like downloading and watching video clips will be impacted by the reduction in fair use policies.
Jordan, regarding your contract, I do apologise, however, the change to our fair use policy doesn?t mean you can get out of your contract with us. In section 7.1.2, of our Pay Monthly Ts & Cs we state that, "We can suspend, change, increase the price of or withdraw part or all of the additional services on giving active users of the additional service a reasonable period of Written Notice".
We feel that we have given you reasonable notice of the changes. Remember, that we aren't increasing our prices and you?ll always be able to browse the internet and email and never get charged more than you agree to.
Reducing your fair use policy will enable us to enhance you existing service when accessing the internet by reducing network data traffic. I'm delighted to tell you that you will still get unlimited internet browsing. If you would like to use the internet for downloading, and require additional usage, you can buy a booster from us for £12.77/mth. We are still the only network that does not charge run on rates and our boosters are priced competitively.
Alternatively, You can call us by dialling 150 from any T-Mobile number or dial 0845 412 5000 using a fixed line (Landline calls are charged at local rates, if you're a BT customer, if you're with a different provider it may cost a bit more, please check with your provider.) We're here from 8AM to 10PM Monday to Friday and 8AM to 8PM on Saturday and Sunday.
Thanks again for your email Jordan, I hope the above information is useful.
If you have further queries, please feel free to reply to this email or visit our help and support section by clicking here.
I haven't even had a text message from them yet, I only know about this from the internet. I am a heavy user, so this is massive for me.