The Magi's Mentor by Erick Olson - Trick

The Magi shows a set of ESP cards. The subject selects a card face down (free choice) and the Magi gives an audience member a business card. The business card is from the Magi's "mentor". The audience member uses their phone to call the Magi's Mentor. The phone rings...and is answered by the mentor (sometimes live or sometimes a recording). The Magi's Mentor tells the subject what card they selected. The subject turns over their chosen card, and it matches your mentor's vision. Easy to perform. Great reactions. No apps!