The repeated calls from a "no caller ID" number that hang up after a few seconds are likely part of a phone scam or telemarketing tactic. Here are a few possibilities for why this might be happening:
Robocalls: It's possible that these calls are generated by an automated system known as a robocall. These systems can dial multiple numbers simultaneously and play a pre-recorded message or connect you to a live operator once you pick up. Sometimes, the system hangs up if it doesn't detect an active line or an available operator to take the call.
Telemarketing: Some telemarketing companies use automated systems to make a large number of calls quickly. If you pick up, the call is then transferred to a live telemarketer. If no telemarketer is available, the system may disconnect the call after a short delay.
Scammers: Scammers often use "no caller ID" or spoofed numbers to hide their identity. The short call duration could be an attempt to get you to call back out of curiosity, but when you do, you might be redirected to a premium rate number or connected to a scammer trying to steal your personal information or money.
Call center testing: Some legitimate call centers may also use automated systems to test the validity of phone numbers before adding them to a list for future marketing or scams.
Regardless of the specific reason, it's essential not to engage with such calls or call back any "no caller ID" numbers that you do not recognize. If the calls persist and become a nuisance, you may want to consider taking the following steps:
Block the number: If your phone allows it, block the "no caller ID" number to prevent further calls from that specific source.
Contact your phone carrier: Some phone carriers offer services to block unwanted calls or provide advice on handling persistent spam calls.
Report the calls: You can report unwanted calls to organizations like the Federal Trade Commission (FTC) in the United States or similar regulatory bodies in other countries.
Do not share personal information: Never provide personal or financial information to unknown callers.
By taking these precautions and being vigilant, you can reduce the impact of unwanted and potentially malicious calls.