Ad Hoc Labs
Firewall: Robo Call Blocker
PaidBlock Spam Calls & Robocalls.
iOSBurner - Smart Phone Numbers
FreeBurner - Free Trial - Phone Number for Private Texts, Calls, and Pictures.
AndroidBurner - Private Calls & Texts, Free Phone Number
FreeBurner is the market-leading phone number app -- the original and best second line for private calling, texting, and picture messaging.
iOS