Installed on an old Sprint phone so that an older family member could have a "home phone" while in town. Big mistake. Sprint Android phones retain the programming info like your phone number on the device even if it's deactivated. Spam/scam calls to that old number, now ported to my current phone, went from like 5 per week to 10+ per day. Seems like the app is all to keen on sharing any info about you to 3rd parties. Also, watch out if you're using app for a 2nd line on an active device.