Company · Directory listing
Callsign
Callsign markets passive authentication, fraud prevention, and intelligence to make digital identity simpler and more secure. Callsign is used for Fraud detection work. Callsign is recorded in United Kingdom. Callsign publishes product information at callsign.com. Callsign is grouped with Fraud detection suppliers. Callsign headquarters are recorded as United Kingdom.
Callsign Ltd
United Kingdom · GB · 1 listing
Customer review aggregate: No published reviews
Ranking status: Directory only — not ranked
Directory ranking uses customer-review stars only. The separately purchased assurance assessment records Bronze/Silver/Gold depth, Assurance Score and risk class; none affects directory position.
Company details
About Callsign
Callsign markets passive authentication, fraud prevention, and intelligence to make digital identity simpler and more secure. Callsign is used for Fraud detection work. Callsign is recorded in United Kingdom. Callsign publishes product information at callsign.com. Callsign is grouped with Fraud detection suppliers. Callsign headquarters are recorded as United Kingdom.
- Legal name
- Callsign Ltd
- Headquarters
- United Kingdom
- Markets
- —
- Company size
- —
Directory & rankings
Customer ranking
Directory only. This listing has no customer stars or ranked position.
- Fraud detection · Directory only · Free listing · ranking code packs from £200 ex VAT
0 customer relationships verified at V3+ · Trustmark assessment results never affect this order.
Listings
Products and services from Callsign
One product is listed for this company. Functional classification, deployment and autonomy are descriptive attributes. Impact class remains a separate assurance result.
- Public JSON for website embeds
Callsign
From their website · not verified evidence
SOFTWARE PRODUCT · Fraud detection · Privacy, Identity & Trust
- Sectors
- Not specified
- Deployment
- Not specified
- Capabilities
- Not specified
- Autonomy
- ASSISTIVE
- Data exposure
- Not specified
What the vendor’s website says · supplier-provided, not verified evidence
Callsign markets passive authentication, fraud prevention, and intelligence to make digital identity simpler and more secure. Public marketing also emphasises passive authentication focus. It is presented for Banks and large digital platforms.
Who they say it is for. Banks and large digital platforms
How they differentiate (vendor-claimed)
- Passive authentication focus
- Fraud + identity intelligence combined
Enterprise quote (supplier-claimed)
Cited from callsign.com · read 2026-09-12. TrustMark has not independently verified these statements.
Verified claims
- Domain associated with this organisation: Yes
- Claim status: UNCLAIMED
- Last verified: 2026-09-17
What we have not verified
AI TrustMark has not independently verified supplier-provided marketing claims on this profile, including untested productivity, ROI or performance figures, unless they appear under verified claims or a named certificate. Absence of a claim from the verified list means it has not been evidenced here.
The organisation description above is supplier-provided unless a specific statement is listed as verified.
Products assessed
No assessed products are listed on this profile yet.
Customer experience
No published reviews yet. Review screenshots appear only with a qualifying Verity review; directory thumbnails from a vendor website are not review evidence.
Customer stories
No consented, relationship-verified customer stories yet.
FAQs
What does Callsign do?
Callsign markets passive authentication, fraud prevention, and intelligence to make digital identity simpler and more secure. Callsign is used for Fraud detection work. Callsign is recorded in United Kingdom. Callsign publishes product information at callsign.com. Callsign is grouped with Fraud detection suppliers. Callsign headquarters are recorded as United Kingdom.
What AI services or products does it provide?
Callsign
Which AI categories does it operate in?
Fraud detection
Has Callsign been independently assessed by AI TrustMark?
No independent assessment result is published. Current listing status: Directory listing.
What procurement or assurance information is available?
Company identity, category assignment and any published certificates or assessment summaries appear on this page. Absence of a field means it has not been evidenced here.
Last verified: 2026-09-17
Methodology version: See current methodology
Why complete verification
Completing verification can improve the quality of the public evidence available on this supplier profile. Useful verified information can deepen the profile and make public questions about the named product more answerable. It does not buy directory ranking, review stars, a higher Assurance Score, a favourable certificate outcome, or a guaranteed Google ranking.
Payment remains independent from rankings and assessment outcomes. Start an assessment · Methodology