Suspicious calls that persist from slightly altered numbers raise red flags about potential harassment or scams. When returning a call results in odd tones and no response, it often signals automated systems used by fraudsters to verify active lines. Hang up immediately on such calls and avoid engaging. Block the numbers through your phone settings or carrier. Report to authorities like the FTC if patterns continue, and consider apps for spam detection. Stay vigilant—never share personal info or click links from unsolicited calls. This behavior matches common tactics to annoy or probe for vulnerabilities.
A mysterious caller keeps redialing from varying numbers; returning the call results in a weird tone and no answer – looks highly dubious.
