Boost $25 unlimited plan

Seems decent if sprint works for you and the free sprint plan isn't something you can or want to sign up for. Though getting a valid phone is challenging with boost (says ex sprint devices not eligible).

$25 a month unlimited inc 8gb hotspot and 50 mins of voice roaming.

Pay for it with cellnuvo gold. New or port in customers only.

Thanks mmfacemm for sharing. Do you, or anybody, know if after activating Boost/Sprint service on an unlocked phone, also compatible with GSM, one can replace the Boost/Sprint SIM with, say, active AT&T SIM, and the AT&T service would work?, ...and return to Boost/Sprint service by replacing the SIM again?

Yes. You can switch SIMs and it will work.