I don't have the Minutes and Mail plan. I have the Unlimited BIS plan. Here's a FAQ from the site. http://www.t-mobile.com/shop/Plans/d...7-4f514ea27cc7
How many text messages do I get with this plan?
With BlackBerry Unlimited, you get 300 free inbound and outbound text messages a month. After that, each message is only $0.10. If your device supports instant messaging, you can also send and receive instant messages.