How Banks and Credit Unions Can Stop Account Takeover Before It Starts

Account takeover rarely starts when money leaves an account.

By that point, a fraudster may have already gathered personal information, compromised credentials or manipulated the phone number connected to the account.

For banks and credit unions, this creates a difficult challenge. Strong customer relationships and personalized service are an advantage, but fraudsters increasingly target the identity signals these institutions rely on to determine whether someone is really who they claim to be.

Stopping account takeover earlier requires identifying signs of risk before access is granted or a transaction is approved.

Account Takeover Starts with Identity

Fraudsters have become skilled at assembling enough information to appear legitimate.

A stolen password or compromised credential may be only one part of the attack. Changes to a customer's phone number, SIM or account information can provide additional opportunities to bypass authentication and gain control.

That means traditional authentication signals may not provide enough context on their own.

A phone number, for example, may match the number on file. But has something about that number recently changed?

That additional context can make the difference between recognizing a trusted customer and identifying potential fraud.

5 Signals Banks and Credit Unions Need to Consider

1. Recent SIM Changes  
   A recent SIM swap can be an important risk indicator, particularly when it occurs close to a login, account change or high-risk transaction.
    

2. Call Forwarding Activity
   Unexpected changes in call forwarding can indicate that communications intended for the legitimate customer are being redirected.
    

3. Phone Number Status
   Knowing whether a number is active, disconnected or otherwise changed can help institutions determine whether the information associated with an account can still be trusted.
    

4. Identity Consistency
   Does the phone number still align with the customer identity associated with the account? Stronger identity context can help uncover inconsistencies that deserve additional review.
    

5. Timing
   A signal becomes more meaningful when considered in context. A recent telecom change followed by an authentication attempt or account update may warrant a different response than either event viewed independently.

Earlier Signals Create More Opportunities to Intervene

The goal is not to treat every change as fraud.

It is to give fraud teams better information when making risk decisions.

Real-time telecom and identity intelligence can add context to existing authentication and fraud workflows. A bank or credit union might require additional verification following a recent SIM change or apply greater scrutiny when multiple risk signals appear together.

This approach allows institutions to respond based on risk rather than adding friction to every customer interaction – and that balance matters. Fraud prevention should strengthen customer relationships rather than make legitimate customers prove themselves at every turn.

Account takeover prevention is increasingly becoming a question of how early an institution can recognize that something has changed.

The earlier the signal appears, the more opportunities there are to act before fraud reaches the account.

See how you can spot account takeover risk earlier. Explore how telecom and identity intelligence can help uncover risk signals and strengthen account takeover prevention.