According to leaked internal documents, T-Mobile and Verizon Wireless may soon offer new unlimited voice/text/web plans. One image, obtained by TmoNews, suggests that T-Mobile will quietly launch a new “Truly Unlimited Data + Talk + Text” option on April 13th that will retail for $79.99 per month. T-Mobile will supposedly not cap data for this plan, but will instead reduce data throughput speeds (throttle) after a user surpasses 2GB in a single billing cycle.

Another image leaked by Droid-Life suggests that Verizon Wireless is also gearing up to release a new unlimited plan for just $50 per month. It will supposedly include unlimited mobile to mobile calling, text, and web for customers opting for service without a contract.

We’re thinking this could be limited to feature phones only, given Verizon’s choice to call it “unlimited web” instead of “unlimited data” — “unlimited data” is terminology Verizon typically uses when referring to smartphones. Neither carrier has officially announced the new plans, however.