After taking lots of flak for announcing a new fair usage data policy that will throttle mobile data speeds after subscribers reach 500MB, T-Mobile UK has now changed a small but key part of its scheme. It will now no longer apply this to existing users, but only those who are new or upgrading only. Once the 500MB limit is breached for these users starting February 1, they will no longer be able to watch online videos and be limited only to browsing the web, e-mailing and accessing social networking sites.