Some things I've learned using RingPlus.
For most people, using cellular voice doesn't work well because of the extreme latency introduced by the Sprint IMS system. If I was ever going to use voice on my Ring+ phones it would be with Hangouts using GV over LTE data (or WiFi). I don't know or care what my Ring+ phone numbers are. I only went with Ring+ because of the free LTE data. Depending on your location Sprint coverage generally sucks.
Luckily, if using SIP (on the OBi) the latency is radically reduced.........at least for me.
I have 2 phones/lines with Ring+. I only use the phones to stream music in my car which works well. I use Google Play Music since it allows a lot of buffering unlike Pandora. I also have one line that includes free tethering.
I have my Ring+ DIDs configured on my OBi's. I route any incoming calls to
VoIP.ms so I can get CNAM and use Nomorobo. But I never get incoming calls on those lines anyway. I only make outgoing SIP calls on those lines which works well. If you have free plans you must make at least 1 outgoing phone call per line every 60 days to retain your free plan. I quite often call the BBC World Service on Audio Now and listen to the news (7124325335).
Tip: If you don't want to hear the music/ads for the ringback tone when making outgoing SIP calls choose "News Flash" under your Ringback Radio. For some reason ads and music usually don't play when using that Radio station. Otherwise choose the Classical music station.