Don't worry about downloading apps -- your iPhone already has several tools to block all those annoying calls and texts from random numbers.

Block spam and robocalls on your iPhone with Who's Call. Real-time AI detection and customizable features keep your phone secure.

1. Tap Settings. 2. Tap Apps near the bottom of the menu. 3. Tap Phone. Under the section Screen Unknown Callers, you'll see ...

Finally, to enable the option to automatically block calls from known spammers, open the Truecaller app. Tap on the Protect tab, go to Calls, and enable the Auto-block spam feature.