Back by popular demand, T-mobile MVNO Solavei is offering 50% off your first two month's of service if you sign up as a new customer by May 31st.  Starting at $39 a month Solavei offers unlimited voice, text and data.  Of course, unlimited at this price means 500mb of 4G LTE and then throttling after that data limit is reached.   Solavei also has a $49, and $69 plan offering you 2GB and 4GB of LTE data respectively.  Solavei markets itself as a social commerce network as they'll pay you $5 a month for every friend you refer to them to signup.  They also advertise that if you sign up enough people you'll get your service for free, or you can even make money.