We have a couple of apps out in the wild that aren't mentioned in the article here (seems like our media relations staff isn't working too hard)!
They're on Google Play and iTunes under the banner "PrivacyStar," and I think they are worth checking out if the permissions / data accessed by other apps (e.g. Hiya) has turned you off in the past. For starters, our apps don't lift your contacts and don't strictly require your personal phone number (the majority of our apps still use your number, but we are moving away from including this data in our analytics). We collect analytic data from devices, but in general it's the minimum amount required to power our nuisance-call prevention systems. (I'm not aware of it being sold or farmed out in any way.)
Anyway, there's my elevator pitch. Just doing my part to get our name out there, we're a small tech company in AR and it's hard to get any attention down here! :)