BELLEVUE, Wash.--(BUSINESS WIRE)--T-Mobile’s (NYSE: TMUS) flagship prepaid brand is helping customers get more of what they want out of their wireless plan − more blazing-fast 4G LTE data. For a limited time, MetroPCS customers can upgrade to Unlimited 4G LTE data for the unheard of price of just $50 per month. That is the undisputed best Unlimited LTE data plan in the prepaid industry. And, unlike some "promotional" offers, when you sign up by April 5, you get Unlimited LTE with no pre-planned