I have an unused Google Voice account, because if I use it, I lose visual voicemail. I also wasn't happy with the lag back when it was GrandCentral. Not sure if Google has done anything to improve that. So I never ported my number over. I want to hold on to it, as I've had it for 11 years now.
I'm also not seeing pricing on sprint.com yet for monthly service. If what I read elsewhere, the idea is probably dead to me already. I'm seeing $69.99 for the base "everything" plan (that I don't care to be forced into), plus $10 a month for 4g, plus $29.99 a month for the mobile hotspot feature for my iPad. That puts me at ~$110 a month plus taxes. I could go unlimited on the iPad and keep "unlimited" on my iPhone and still be below that cost.