Boost Mobile is an excellent phone carrier! I have the Sanyo Incognito under the CDMA network. The service (CDMA) runs on the Sprint network. I have not experienced an issue with my mobile phone nor have I had an issue with Boost Mobile. It's a great service with high speed data transfer, excellent text messaging service, and call quality is perfect. I have never had a drop call. I have had Cricket and MetroPCS, experiencing drop calls from those two carriers as well as failed text messages.
I would recommend for you to take on Boost Mobile. By experience, do not chose an iDEN series phone which runs on Nextel's network. CDMA with Sprint is the way to go.