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Security report for tmobile.com

T-Mobile US · Telecommunications · United States

Medium risk. 5 critical or high findings in GDPR outside view, SSL/TLS and 1 other check.

Security score

51/100

Risk levelMedium

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

T-Mobile US is a leading telecommunications company providing wireless phone plans, devices, and home internet services primarily in the United States and Puerto Rico. The website reflects a mature digital presence with comprehensive product offerings, promotional deals, and customer benefits. It targets both consumer and business segments with a strong emphasis on 5G technology and competitive pricing. The company is a subsidiary of Deutsche Telekom and maintains consistent branding and messaging across its digital assets. Technically, the website leverages modern web technologies including Adobe Experience Manager, Alpine.js, and various third-party SDKs for analytics, marketing, and payment processing. The site is hosted on Akamai CDN, ensuring global content delivery. While the site is mobile-optimized and accessible, performance metrics are not provided, but the design and navigation are professional and user-friendly. From a security perspective, the site implements essential security headers and HSTS with preload, but the SSL certificate is currently invalid or missing, which is a critical issue impacting the overall security posture. No major vulnerabilities or exposed sensitive data were detected. Privacy compliance is strong with clear privacy and cookie policies, consent mechanisms, and GDPR indicators. Overall, the website is trustworthy and professional but requires immediate attention to SSL certificate management and TLS protocol support to enhance security and user trust. Strategic recommendations include updating SSL certificates, enabling modern TLS protocols, and continuous monitoring of security headers and compliance frameworks.

Scanned

NIS2 and GDPR posture

GDPR outside view
18/ 100 · Critical
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

5 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 Policy found

      GDPR requires clear information about cookie usage

      What to do: Add a dedicated cookie policy explaining cookie usage and purposes

    • 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

  3. Security headers

    Security headers are instructions your web server sends to every visitor’s browser. Missing ones leave visitors more exposed to attacks such as clickjacking and injected scripts.

    • High

      Missing X-Frame-Options header

      Prevents clickjacking attacks

      What to do: Add "X-Frame-Options: DENY" or "X-Frame-Options: SAMEORIGIN"

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

Keep watching tmobile.com

This scan found 16 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.

Daily monitoring

Recommended

€25per month

  • 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
55
Email security
50
DNS health
85
Network security
100
GDPR outside view
18
Average
51

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

T-Mobile US holds a strong market position as a major wireless carrier in the US, offering a variety of plans tailored to different customer needs including Essentials, Experience More, and Experience Beyond. Their business model combines direct consumer sales, device trade-ins, and value-added services such as streaming benefits and device protection plans. The company targets a broad audience including individual consumers, families, and businesses. Partnerships with device manufacturers like Apple, Samsung, Google, and Motorola are evident through promotional content. The presence of multiple subsidiaries and a parent company (Deutsche Telekom) indicates a large, complex organizational structure. The website's content and structure support customer acquisition, retention, and upselling strategies effectively.

Security posture

The website demonstrates a moderate security maturity level with implementation of key security headers such as Content-Security-Policy, X-Content-Type-Options, and Strict-Transport-Security with preload. However, the absence of a valid SSL certificate and lack of support for modern TLS protocols (TLS 1.2 and 1.3) significantly reduce the security score. No known vulnerabilities like Heartbleed or POODLE were detected. The site uses secure cookies and has mechanisms for input validation in forms, though explicit details on form security are limited. Privacy policies and cookie consent mechanisms are in place, indicating compliance with data protection regulations. Incident response contact information is not explicitly found. Overall, the site is secure but requires urgent remediation of SSL/TLS issues to protect user data and maintain trust.

Recommendations

  1. Renew and properly configure SSL/TLS certificates to ensure HTTPS is fully functional.
  2. Enable and enforce TLS 1.2 or higher protocols to enhance encryption standards.
  3. Implement OCSP stapling to improve certificate validation performance and security.
  4. Regularly audit and update security headers to align with best practices.
  5. Provide explicit incident response and vulnerability disclosure contact information to improve transparency and trust.
Technical notes

Notes

The website is built on Adobe Experience Manager CMS and utilizes a modern tech stack including Alpine.js for interactivity and various SDKs for analytics, marketing, and payment processing. It is hosted on Akamai CDN, which supports global content delivery and performance optimization. The site includes comprehensive structured data (JSON-LD) for SEO and business information. While the site is mobile-optimized and accessible, performance data is missing, preventing full assessment of load times and resource efficiency. The presence of multiple third-party scripts indicates a complex integration environment that requires careful management to avoid performance and security issues. Technical debt appears low, but SSL/TLS misconfiguration is a critical risk that needs immediate attention.
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

Earlier scans of this domain

  1. 51/100Medium24 findingsView report
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