Ever wonder why a silent line keeps ringing you back? Those dead‑air calls are classic hallmarks of a robocall sweep—machines dialing en masse to verify active numbers. Since no one ever speaks, the system logs a successful connection and flags the line as viable for future spam or phishing scripts. The safest play is to let the call go to voicemail, then block the prefix in your phone settings or use a carrier‑provided blacklist. Consider registering with the national Do Not Call registry and report persistent silence calls to your telecom provider. Keeping a log of timestamps can also help authorities spot patterns and curb the nuisance.
I receive daily calls from numbers beginning with 02 8395; they never pick up and just hang up.
I ended the call quickly, suspecting a scam.
After a few seconds of complete quiet, the line dropped; likely they were harvesting real numbers to resell.