Another options would be Ting (link to plans). They are another Sprint MVNO. You pay $6/month, plus tiered usage, eg 500 minutes = $9 and 4000 text = $11, but 3gb of data will cost you $60 shocked so disabling data might be a good idea smile
They have a number of smart phones, and let you bring most Sprint phone to their system, excluding the iPhone and I believe the Nexus (though I now see that available for sale on their site, so that may have changed).