A single missed call from an unknown number that immediately rings as 'unavailable' raises eyebrows—it's a tactic often used to dodge identification. This could be the start of a nuisance pattern, where callers test if you'll pick up before escalating to more persistent attempts. Don't call back right away; it might confirm your number is active and invite more harassment. Instead, block the number through your phone settings or carrier app to prevent repeats. If it persists, log the details and report to authorities like the Do Not Call registry for tracking. Staying vigilant keeps these intrusions at bay without unnecessary stress.
I missed a call from them about an hour ago, even though the number showed as unavailable.