Unlike AT&T Call Protect, RealCall's spam database is updated all the time, which has billion known spam numbers. You can search any phone number to view details, like number security, owner's carrier or address, etc. RealCall also faces all the users around the world, especially in the US. However, AT&T Call Protect only supports users who use AT&T's network.
On RealCall, Answer Bots can mimic any voices to talk with annoying telemarketers. But AT&T Call Protect can't do that. Besides pre-recording audio files available, it also allows you to customize your own. So you don't need to waste words and time to trick spammers. Let RealCall teach them a lesson!
In addition to blocking spam calls, RealCall can detect fraud text messages or custom keywords based on Machine Learning technology. Scammers may occasionally get through the call blocking, but they can't get out of Fraud SMS Detection. AT&T Call Protect doesn't have that feature.