Spam calls from area code 331? Here’s how to stop them.
Area code 331 covers Chicago, IL — but the spammers calling you aren’t there. They’re faking it. Here’s the fix.
If your phone keeps lighting up with calls from area code 331, here’s the truth: it’s almost certainly not someone in Chicago, IL. It’s a robocaller spoofing a the west suburbs number so the call looks local and you pick up. You hang up, they dial the next 331 number. You are one row in a spreadsheet.
The move isn’t to block 331. Real calls come from 331 too. The move is to screen it — known callers ring through, unknown 331 numbers hit a wall first.
Why 331 specifically?
Spoofing engines pull the first six digits of your number and dial out matching 331 numbers — the “neighbor” trick. A call that shares your area code and prefix feels safe, so answer rates jump. That’s the entire scam: familiarity. Learn the mechanics in neighbor spoofing and why you got picked in why me?
Shut down 331 spam calls — free
- Silence unknown callers. The single biggest win. Set it up on iPhone or Android in 30 seconds.
- Turn on your carrier’s filter. Free on AT&T, Verizon, and T-Mobile.
- Register on the Do Not Call list. Won’t stop scammers, but it makes the legal ones back off and gives you standing to report.
- Weaponize the rest. The calls that still get through? Hand them to the Crew — an AI answers in character and wastes the scammer’s time on a call they thought was a live mark.
Why am I getting spam calls from area code 331?
Because scammers spoof it. Auto-dialers fake a 331 (Chicago) number so the call looks local and you’re more likely to answer. The caller is almost never actually in Chicago — the number is a mask. This is called neighbor spoofing.
Is a call from 331 always spam?
No. Real people and businesses in Chicago use 331 too. That’s exactly why blanket-blocking the whole area code backfires — you’d miss real calls. The fix is screening: let known contacts ring through and send unknown 331 numbers to a screener first.
How do I stop 331 spam calls for free?
Turn on Silence Unknown Callers (iPhone / Android), register on the Do Not Call list, and add your carrier’s free spam filter. For the ones that still slip through, hand them to the Crew and let AI waste their time instead of yours.