Because SIM swap and number porting redirect a customer's number to an attacker, an SMS or voice OTP sent to that number can reach the attacker, which is why NIST lists SIM change and porting as risk indicators and the FCC regulates carrier-side SIM change authentication.
inferred · Checked 2026-09-30
- Vendor
- NIST
- Product
- SP 800-63B-4
- Subsystem
- out-of-band authenticators
- Deployment
- any
- Region
- us
- Release range
- current as of 2026-09-30
- Status
- inferred
- Checked
- 2026-09-30
Sources
- NIST SP 800-63B-4 Digital Identity Guidelines: Authentication and Authenticator Management — National Institute of Standards and Technology · tier 1 standards and regulators · Sec. 3.1.3.3, read with 47 CFR 64.2010(h)
Cite this note
APA
WarmTransfer. (2026, September 30). Caller authentication and fraud prevention in contact centers: source note contact-center-caller-authentication-sim-swap-undermines-otp. WarmTransfer. https://warmtransfer.net/knowledge/claims/contact-center-caller-authentication-sim-swap-undermines-otp
BibTeX
@misc{warmtransfer-claim-contact-center-caller-authentication-sim-swap-undermines-otp,
title = {Caller authentication and fraud prevention in contact centers: source note contact-center-caller-authentication-sim-swap-undermines-otp},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/contact-center-caller-authentication-sim-swap-undermines-otp},
note = {Source note contact-center-caller-authentication-sim-swap-undermines-otp, checked 2026-09-30}
}