3 ms·No required. In iOS can be disabled.by f1shy 4y agoNo required. In iOS can be disabled.Tomte 4y agoThe highest level cannot. We just had a nationwide test in Germany a few days ago.f1shy 4y agoI have 2 phones. In one I disabled it, and did not get the alarm. The other one was enabled and received the alarm. It can be disabled. Period.