this on RingPlus Discourse Forum:
"RingPlus is offering a new free plan (the Future Plan) which has 1000Min / 1000 Text / 1GB per month. Overages for all types are 2 cents. This offer is for new members only and will only last until 9pm PDT.
If you want to keep this plan for longer than one month, you will have to top up $5 which will be a standing credit on your account for any overages. There is currently no auto top-up features on this plan.
This plan is free and requires Bring Your Own Sprint Device. You can check the device at https://my.ringplus.net/device_validation_requests/new124
You can sign up at https://ringplus.net134 starting NOW (6pm PDT), Sept 22, 2015
This program is being offered only ONE TIME ONLY as a part of an ongoing communications research project at RingPlus.
We do apologize to current members who cannot take part in this promotional experiment"
This is an great deal but you only have less than and hour and a half to get in on it!