It is an unlimited plan. You get unlimited minutes for talk and text. you just have to renew every 30 days.
Unlimited talk and text for 30 days
Unlimited min, and yes that expires at the end of 30 days of service unless you re-new with another min. card
You get unlimited minutes for 30 days, as well as unlimited texting, and data. After 30 days you must activate another $45 service card for another 30 days of unlimited minutes, texting, and data.
They have a use, don't abuse, policy so if they find you are using substantially more phone resources than the typical user they may terminate your service early and require you to activate another $45 service card before you 30 days are up. Check the Terms of Service before signing up, but a reasonably normal user should happy with the plan.