Be cautious with repeated calls from unknown numbers that end abruptly—it's a classic sign of nuisance harassment or automated systems testing active lines. This pattern, with slight variations in digits, suggests persistent annoyance rather than a legitimate outreach. Block the number and any similar ones immediately using your phone's settings or carrier tools to stop the cycle. If it escalates, report to authorities like the Do Not Call registry for investigation. Don't engage or call back, as that could confirm your line is live and invite more spam. Track call times and frequencies to build a case if needed.
Calls keep coming from this number and variations of the last two digits; whenever I answer, the line hangs up – this has been happening for weeks.