In plain words
Scammers pair a scary authority ('your bank', 'the police') with a countdown AND an ask — money, a code, your details. Urgency alone is not the tell; urgency plus an ask is. A real emergency survives one verification call. Fear plus a deadline plus an ask is a script.
A link in a DM or SMS is not a safe way in: the official app, or an address typed by hand, is where a claim can be checked. The link chooses where you go; typing the address means YOU choose.
Two worked examples
US
A scheme 'guarantees' 30% a month.
Safe government bills pay a few percent a YEAR — anything promising many times that with no risk is paying old members with new members' money.
Nigeria
A scheme 'guarantees' 30% a month on a ₦100k deposit.
That is 360% a year before compounding — many times what Treasury bills, short loans to the Federal Government, pay in a year.
Only new members' money can pay that.
The common mistake
"Guaranteed 50%" is the scam itself
The mistake: Believing an offer can be both guaranteed and unusually high.
What’s true: Real returns wobble — a flat, high, sure number is the signature of money leaving, not arriving.
Vishing
US
'This is your bank — your account will be blocked in 30 minutes, read out the code we just sent.' Banks do not ask you to read out one-time codes.
The number on the card reaches the real bank.
Nigeria
'This is your bank — your BVN will be blocked in 30 minutes, read out your OTP.' Banks do not ask you to read out an OTP.
The number on the card reaches the real bank.
Smishing
UK
'Your £150 refund failed — tap secure-bank-refund.example.' Your bank's real site is the one you open yourself — from its app or an address you type.
The banking app, opened directly, would show any real refund; this one will not exist.
Japan
'Your ¥20,000 refund failed — tap secure-bank-refund.example.' Your bank's real site is the one you open yourself — from its app or an address you type.
The banking app, opened directly, would show any real refund; this one will not exist.
Where you’ll meet it
- No return without riskThe extra return is payment for stomaching the swings — remove the swings and the pay disappears.
- The gotcha clause hides on page 3The headline is marketing; the clause is the contract — the expensive sentence is the quiet one.
- Deposit insurance has a limitThe cover follows the bank, not you: the same limit applies at each bank, and only to deposits.
Related terms
Ponzi schemePyramid schemeVishingPhishingSmishingAdvance-fee scamPush payment scamRomance scamSIM swapMoney muleIdentity theftTwo-factor login
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Education, not financial advice Source: Theorise lesson text