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Security report for tescomobile.com

Tesco Mobile Limited · Telecommunications · United Kingdom

Medium risk. 3 critical or high findings in GDPR outside view and SSL/TLS.

Security score

68/100

Risk levelMedium

0–100, higher is better. How it is calculated

Tesco Mobile Limited is a prominent UK telecommunications provider offering a wide range of mobile phones, pay monthly contracts, SIM only deals, and pay as you go plans. The company leverages the O2 network to provide extensive UK coverage including 5G services. Tesco Mobile integrates its loyalty program, Clubcard, to offer customers rewards and exclusive pricing, positioning itself as a customer-centric and service-oriented network. The website reflects a mature digital presence with professional design, clear navigation, and comprehensive product information targeting both personal and business customers in the UK market. Technically, the site is built on Magento with modern JavaScript frameworks and integrates advanced search and analytics tools such as Algolia and New Relic, ensuring good performance and user experience across devices. Security posture is strong with HTTPS enforced and secure form handling, although explicit security policies and incident response contacts are not publicly detailed. Privacy compliance is well addressed with clear cookie and privacy policies and consent mechanisms. Overall, Tesco Mobile's website demonstrates a high level of professionalism, trustworthiness, and digital maturity suitable for a large telecommunications brand.

Scanned

NIS2 and GDPR posture

GDPR outside view
60/ 100 · Medium
Checks completed
7of 7

NIS2 Art. 21(2)

  1. (a) Risk analysis and security policies: Not visible from outside
  2. (b) Incident handling: One indicator
  3. (c) Business continuity, backups and crisis management: Not visible from outside
  4. (d) Supply chain security: Not visible from outside
  5. (e) Secure acquisition, development and maintenance, including vulnerability handling: Partly checked
  6. (f) Assessing the effectiveness of security measures: Not visible from outside
  7. (g) Cyber hygiene and security training: Not visible from outside
  8. (h) Cryptography and encryption: Partly checked
  9. (i) HR security, access control and asset management: One indicator
  10. (j) Multi-factor authentication and secured communications: Not visible from outside

This scan rated NIS2 with an earlier keyword method that is no longer shown; rescan for the per-article view. Risk management, continuity, supply chain, training, MFA, management oversight (Art. 20) and incident reporting (Art. 23) need internal evidence, and Guard cannot tell whether NIS2 applies to this organisation.

GDPR is indicative only, based on publicly visible signals: Articles 7, 12, 13 and 32 of Regulation (EU) 2016/679 and Article 5(3) of the ePrivacy Directive. Not a certification or legal assessment.

Priority findings

3 findings rated critical or high. Fix these first.

  1. GDPR outside view

    These are the privacy signals visitors and data protection authorities look for under GDPR.

    • Critical

      No HTTPS encryption

      GDPR requires appropriate security measures for personal data

      What to do: Implement SSL/TLS certificate for HTTPS

    • High

      No Cookie Consent Banner found

      GDPR requires explicit consent for non-essential cookies

      What to do: Implement a cookie consent banner that appears on first visit

  2. SSL/TLS

    TLS encrypts the connection and proves the site is really yours. Weak or expiring certificates trigger browser warnings and put traffic at risk.

    • Critical

      No HTTPS Encryption

      Website does not use HTTPS encryption, making all data transmission vulnerable to interception

      What to do: Implement SSL/TLS certificate and redirect all HTTP traffic to HTTPS

Need hands-on remediation? Email guard@offseq.com

Keep watching tescomobile.com

This scan found 12 issues across 6 checks. Monitoring re-runs those checks daily, emails you when something material changes and records each fix, so you can show progress.

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  • TLS certificates and expiry
  • DNS records
  • SPF, DKIM and DMARC
  • Security headers
  • GDPR and NIS2 posture
  • Exposed services
  • Third-party trackers
  • Security score drift

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Results by check

Each check with its score, findings and the evidence it collected.

How this score is calculated

The security score runs 0–100, higher is better. It is the plain average of the security checks that completed in this scan, each counted equally. A check that could not run is left out: it counts neither as a pass nor as a fail.

Counted in this score

SSL/TLS
0
Security headers
85
Email security
80
DNS health
85
Network security
100
GDPR outside view
60
Average
68

Not counted

  • NIS2 outside view: Re-weights evidence from the TLS, email, DNS, network and hygiene checks, so counting it would count that evidence twice. Shown on its own.
  • OffSeq Observations: An AI reading of the site, useful context but not reproducible evidence. Shown on its own.

Findings that cap the score at 49

Each of these is serious on its own, so while any is present the site cannot rate better than high risk, however good the other checks are.

  • The certificate is not trusted by browsers
  • The website is not served over HTTPS
  • A database, remote desktop, file-sharing or Telnet service is reachable from the internet
  • The page loads a script from a compromised source
  • The domain registration has expired
  • SPF authorises every server to send mail as the domain

Partial scans

When the site blocks Guard or most checks cannot run, the score covers only the checks that ran (usually DNS and email), is capped at 75 and is shown as partial, without a risk level.

Risk levels

  • Critical0–25
  • High26–49
  • Medium50–75
  • Low76–100

Technical appendix

Business context, site observations and technical notes gathered during the scan, and the standards behind each reference.

Business context

Business profile

Tesco Mobile operates in the UK telecommunications sector as a large retail and service provider. It benefits from the backing of Tesco PLC, a major retail conglomerate, enhancing its market credibility and reach. The business model combines mobile network services with a loyalty rewards program (Clubcard), creating a competitive advantage by linking mobile spending with retail benefits. The company targets a broad audience including individual consumers and business clients, offering a variety of devices and plans. Strategic partnerships with O2 for network infrastructure and third-party service providers for support and app distribution strengthen its ecosystem. The website content and structure indicate a focus on customer service excellence, evidenced by awards and high Trustpilot ratings. Growth indicators include frequent promotions, trade-in programs, and a strong digital marketing presence. The company maintains a consistent brand image and leverages multiple digital channels for customer engagement.

Security posture

Tesco Mobile's website exhibits a mature security posture with mandatory HTTPS usage and secure form tokens to prevent CSRF attacks. The presence of New Relic monitoring and tag management via Tealium indicates active performance and security monitoring. No exposed sensitive data or vulnerable libraries were detected in the analyzed content. However, the absence of a publicly accessible security policy or vulnerability disclosure page and lack of incident response contact details represent gaps in transparency and readiness communication. The site likely employs standard security headers, though explicit confirmation is not visible in the HTML. Overall, the security measures align with industry best practices for e-commerce and telecommunications websites, but could be enhanced by publishing detailed security and incident response information.

Recommendations

  1. Publish a dedicated security policy and vulnerability disclosure page to improve transparency and user trust.
  2. Provide clear incident response contact channels such as security@ or abuse@ email addresses.
  3. Verify and explicitly implement security headers like Content-Security-Policy, X-Frame-Options, and X-Content-Type-Options.
  4. Regularly audit and update third-party scripts and libraries to mitigate potential vulnerabilities.
  5. Enhance visibility of data protection officer contact information to comply with GDPR transparency requirements.

Contact details published on the site

Addresses
Legal name
Tesco Mobile Limited
Registration number
723698
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Tesco Mobile Limited
Description
Tesco Mobile offers mobile phones, phone contracts, SIM only deals, and pay as you go plans. It provides Clubcard benefits and operates on the O2 network with 99% UK coverage and 5G availability.
Key services
Pay monthly phones, SIM only contracts, Pay as you go phones, Trade-in services, Clubcard rewards
Content quality
excellent
Branding
consistent

Technology

Stack
Magento (implied by JS paths and structure), RequireJS, Algolia Search, New Relic monitoring, Tealium Tag Management, Google Tag Manager, Scene7 image CDN
Frameworks
Magento Commerce, RequireJS
Platforms
Web (desktop and mobile optimized)
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Use of CSP (likely)
  • No exposed sensitive data in HTML
  • Secure forms with CSRF tokens (form_key present)

Analytics and tracking

Services
New Relic, Google Tag Manager, Tealium
Tracking level
extensive
Privacy practices
good

Advertising

Ad networks
Google Ads
Tracking pixels
New Relic, Tealium
Marketing tools
Algolia Search, Tealium Tag Management
Transparency
good

Site quality

Design
excellent
User experience
excellent
Content relevance
excellent
Navigation
excellent
Professionalism
excellent
Trustworthiness
high

Key observations

  1. Website is fully accessible with rich content and no blocking.
  2. Strong brand presence with consistent branding and professional design.
  3. Comprehensive product offerings with detailed descriptions and images.
  4. Use of modern web technologies and performance optimizations.
  5. Good privacy and cookie policy presence with consent mechanisms.
  6. No explicit security policy or incident response contact found.
  7. Use of multiple third-party analytics and marketing tools.
  8. Clear contact information including phone and physical address.
  9. No suspicious or malicious indicators detected.
Technical notes

Notes

The website is built on Magento Commerce platform, utilizing RequireJS for modular JavaScript loading and Algolia for advanced search capabilities. It integrates New Relic for performance monitoring and Tealium for tag management, indicating a sophisticated digital infrastructure. The site uses Scene7 CDN for optimized image delivery and Google Tag Manager for analytics. Performance is optimized with preloading of fonts and scripts, responsive design for mobile devices, and accessibility considerations. The technical stack supports a fast, reliable, and user-friendly experience. Opportunities exist to further modernize by adopting newer JavaScript frameworks or enhancing accessibility features. Technical risks are minimal but require ongoing maintenance of third-party dependencies and security configurations.
Standards and sources

Reference chips under each finding point to the standard, regulation or specification the finding relates to. They are taken from the official datasets below and mapped conservatively: a finding with no defensible link shows none. NIS2 and GDPR references mark where a finding is relevant evidence, not a compliance verdict. Implementing Regulation (EU) 2024/2690 binds digital infrastructure and digital service providers; for other entities it is the most detailed public reading of the Article 21 measures. WCAG, EN 301 549, European Accessibility Act and Web Accessibility Directive references name the requirement an automated accessibility rule relates to; they are not a conformance verdict.

Retrieved 2026-10-25

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