T-Mobile(s tmus) announced on Monday it is making changes to its prepaid Pay As You Go plans, simplifying the billing rate as well as adding an option to add limited-time LTE data passes. Previously, prepaid minute purchases at T-Mobile were tiered: If you bought 30 prepaid minutes, it would cost $10. Compare that to 1000 minutes for $100 — those are two very different per-minute rates. Starting August 17, after a $3 monthly minimum charge that includes 30 minutes, a single minute or text message costs $.10. If you’d like data, $5 gets you a one-day pass with 500MB. There’s a $10 option for a seven-day pass with 1GB of LTE-eligible data as well.