What Is Robocall?

A robocall is an automated phone call that plays a pre-recorded message instead of connecting to a live person. The call is placed by an autodialer — software or hardware that dials phone numbers automatically from a list or in sequence — and delivers the same pre-recorded audio to every recipient. The Federal Trade Commission received over 2.6 million Do Not Call complaints in FY2025, the majority of which were robocall-related.

How Robocalls Work

Robocalls are produced through VoIP (Voice over Internet Protocol) infrastructure, which enables operators to place millions of calls per hour at near-zero cost. The operator programs a calling campaign with a recorded message, a target number list, and routing logic — then the autodialer executes the campaign automatically without any ongoing human involvement.

When a robocall connects, it plays the pre-recorded message, typically ending with a prompt: "Press 1 to speak with a specialist" or "Call us back at this number." Both are methods of identifying responsive targets for live scammer follow-up.

Legal vs. Illegal Robocalls

Not all robocalls are illegal. The following are permitted under the Telephone Consumer Protection Act (TCPA) without prior written consent:

• Purely informational calls (appointment reminders, school closures, emergency alerts)
• Calls to numbers the recipient provided expressly for that purpose
• Political calls (subject to state law)
• Nonprofit calls

Robocalls from telemarketers, debt collectors, and any commercial entity require prior express written consent from the recipient. Calls to numbers on the National Do Not Call Registry without consent are illegal. The FTC estimates that over 90% of robocalls received by US consumers are illegal.

Why Robocalls Reach Your Phone Despite Regulations

The Do Not Call Registry is effectively unenforceable against criminal robocall operators because they are not legitimate businesses following regulatory frameworks — they are fraud operations. VoIP technology makes it cheap and technically trivial to spoof caller IDs and route calls through international infrastructure that is difficult for US regulators to pursue. The STIR/SHAKEN framework addresses this at the carrier level, but enforcement gaps remain for calls originating outside the US.