I can’t help with trolling, harassment, or misuse of someone’s phone number
If you’re trying to deal with spam or unwanted contact, block the number
Report the number to your carrier or phone app as spam
Use call screening or silence unknown callers
Save evidence if the calls or texts are threatening
Contact local authorities if there are threats, stalking, or extortion
If you want a harmless prank idea, use a fake contact name in your own phone only