T-Mobile is celebrating their 10th anniversary in style - with new unlimited data plans. Announced in August, the new Unlimited Nationwide 4G Data plan gives customers all the data they can scarf up for a flat price. Users can add the unlimited data to an existing plan - $30/month on the Classic Plan or $20/month on the Value Plan. This brings them in lower than both AT&T and Verizon (depending on the amount of devices and choice of plan of course). While T-Mobile doesn't have LTE options yet, perhaps the unlimited data will keep them in the running of top carriers for a while.