Same number. New SIM?
Spot recent SIM changes before you approve a payment, a reset or any other risky action.
Illustrative
A code only proves who holds the SIM. Check the SIM hasn’t just changed before you trust it.
The SIM swap check spots recent SIM changes, so you can add a stronger check at exactly the moments that carry risk.
One question before you approve.
Has this number moved to a new SIM recently? The answer decides what happens next.
Asks to be approved.
When the SIM moves, so do the codes.
If a number is moved to a new SIM, calls and codes can reach a different phone. A recent change is a signal to look harder.
- The number stays the same
- The phone holding it does not
- A code alone can no longer be trusted
Before the moments that carry risk.
Run the check just before an action you cannot easily undo.
- 01Payments and transfersCheck the number before money moves.
- 02Password resetMake sure the owner is the one asking.
- 03New device sign-inA new device plus a new SIM is worth a pause.
- 04High-risk actionsStep up only when the risk score says so.
A stronger check only when it counts.
A recent SIM change feeds the risk score. Low-risk users stay on a code only. High-risk users get a stronger check on top.
Illustrative scores
One lookup, the whole picture.
Number lookup already returns line type, carrier and reachability. The SIM change sits beside them, so one request tells you what to do.
- Line type
- Mobile
- Carrier
- Reachable network
- Reachability
- Reachable
- SIM change
- Recent
Ask once, get a clear answer.
Send the number from your own backend. The response says whether the SIM changed, so your code can choose the next step.
- One request per risky action
- A plain yes or no on recent change
- Works beside your own risk rules
→ { "to": "+44 7700 900123" } ← { "sim_changed_recently": true }
You decide what the result means.
The check gives you the signal. Your rules choose the response, from a quiet approval to a full stop.
Approve
No recent change. Let the action through with a code only.
Step up
Recent change. Add a stronger check before you approve.
Hold
Too risky. Pause the action and send it for review.
Illustrative responses
One API for trust at every step.
The SIM swap check works with Verify & OTP: codes by SMS, voice and WhatsApp, number lookup and fraud checks in one API, built for apps and banks and sold by you under your brand.
SIM swap checks, answered.
It spots recent SIM changes on a number before you approve a risky action.
When a number moves to a new SIM, calls and codes can reach a different phone. A recent change is a signal to check more carefully.
Before moments that matter, such as payments and transfers, password resets and other high-risk actions.
No. You step up only when the risk score says so. Low-risk users can stay on a code only.
Yes. It sits with Verify & OTP, alongside number lookup, fraud checks and codes by SMS, voice and WhatsApp.
Catch the swap before the loss.
Talk to partnerships about SIM swap checks in Verify & OTP.