With more companies encroaching on its territory, MetroPCS introduced a new $50 rate plan today for its latest phone, the BlackBerry Curve 8330.

The company, which already offers some of the cheapest all-you-can-talk plans in the industry, has faced increased competition from T-Mobile and Boost Mobile, both which introduced $50 unlimited talk/text plans in the past two months.

(Read the earlier stories, “Boost Mobile adds ‘tax-free’ $50/month unlimited plan” and “Are $50 unlimited plans latest trend? T-Mobile follows Boost.“)

MetroPCS’s latest twist is that the $50 will get customers unlimited BlackBerry e-mail access, not to mention unlimited talk, texting, web browsing and MMS. No signed contract either.  For $10 more per month, users can connect to the BlackBerry enterprise server for corporate messaging.

Comparably, BlackBerry e-mail plans can add $30 more per month. More details about MetroPCS’ plan are HERE.

FierceWireless points out that MetroPCS’ plan is in direct competition with the new plan from Boost, based in Irvine. The wireless research company interviewed Matt Carter, Boost’s president, who said that Boost plans on introducing a phone with a QWERTY keyboard later this year.

Check out the Gadgetress Guide to local cell phone services. More cell-phone news:

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