Those used to be called Simple Choice plans. However now TMobile one is the only plan available. It is unlimited talk text and data. You may be able to find limited plans for prepaid but my also find that having two lines having the one plan might be cheaper. There are also prepaid plans with pay as you go.
snn555 is right about our T-Mobile One plans. You should check out the links posted and see if those plans fit your needs. Please let us know if you have more questions.