Someone picks up your phone and prank calls 911 without telling you, and then slips it back into your possession, without you noticing. Or stays on the line unt

Someone picks up your phone and prank calls 911 without telling you, and then slips it back into your possession, without you noticing. Or stays on the line until emergency services arrive, and then abandons it, at which point it gets confiscated for investigation, and turns out to belong to you. What would the punishment be for a situation where you leave your phone unattended, and it gets misused?