<p>In one of the other test taking rooms in my school district, someone’s cell phone went off and all of the room’s 30 tests were invalidated. The proctor simply reported the issue and Collegeboard decided the invalidation.</p>
<p>Collegeboard has become more stringent on this kind of stuff, so act cautiously. Because the calculator wasn’t audible and didn’t affect others, most likely only his would be invalidated if reported IMO.</p>