Sell it on ebay to another RW person. I sold my two old ones when I moved to the Moto G and got some money for them. I was surprised because the Moto G is totally worth it and I would not have recommended those old models to anyone.
This is doing the same things as Republic Wireless. Calls and texts over wifi to keep their carrier costs down. RW is cheaper at $10 a month without data and $25 for unlimited 3G.
With RW you need their customized android phone but they are cheap. $650 for the phone is steep (or a credit pull).