Multiple rings from an unidentified source within a tight timeframe signal classic spam tactics designed to provoke callbacks. No voicemail left heightens suspicion, as legitimate callers typically identify themselves. Patterns like this often aim to verify active numbers for further harassment or data harvesting. Block the number immediately to curb persistence, and report it to your carrier or apps like Truecaller for community flagging. If calls escalate, consider registering with a do-not-call list, though effectiveness varies against rogue operators. Stay vigilant—spam evolves quickly, so updating call-screening tools helps filter out nuisances proactively.
The caller was unidentified, flagged as "Suspected Spam," and rang three times within 90 minutes without leaving a message.