Nomorobo – Call Blocking for iPhone
Over on The Sweet Setup, Nomorobo was chosen as the best spam call blocking app for iPhone. I tried multiple options, and I kept coming back to Nomorobo as the best overall app. It has a clear business model, it respects your privacy, and has virtually eliminated spam calls (which had been on the rise) for me.
The app is $1.99/month or $19.99/year. It includes a free trial, so download it on the App Store for free to give it a shot.
Be sure to read my entire review on The Sweet Setup.