Texas teens help create Guardial, a safety call app, in hopes to prevent potential danger Three teenagers created a personal safety phone app. With the click of a button, it can send your location and message emergency contacts and 911. Author: Tiffany Liou Updated: 2:39 AM CDT July 15, 2021 DALLAS — Harish Kolli, 16, of Austin, is an incoming junior in high school. He was scrolling through TikTok when he saw videos of fake phone calls, created to deter potential attackers. It sparked the idea for Guardial, a phone application Kolli co-founded with two other teenagers across the country. He met Kaitlin Tan from Coppell, Texas and Mahi Ravi from Saratoga, California through Stanford University's Gifted and Talented Silicon Valley Innovators program. Together, they created Guardial.