A class action lawsuit has been filed in California, claiming that T-Mobile deceptively marketed its data plans as unlimited, while capping the data at 5 or 10 gigabytes before blocking off access to the 3G network and reducing the data transfer speeds. The complaint also mentions that the plaintiff purchased T-Mobile phones that required him to agree to a two-year contract, but there was no mention of a data cap on the contract. It’s quite common of carriers to impose speed caps on their data plans after a certain quota has been met, though it’s always best to inform the customer of such caps, so as to avoid such sticky situations. The suit requests an injunction preventing T-Mobile from advertising its data plans as such, preventing T-Mobile from selling the current “unlimited” data plans.