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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 provider in the United States, offering a wide range of wireless products, phone plans, devices, and home internet services. As a subsidiary of Deutsche Telekom AG, it holds a strong market position with a mature domain and extensive customer benefits including streaming services and scam protection. The website is professionally designed, mobile-optimized, and provides comprehensive information about its offerings and customer support channels. Technically, the site uses modern frameworks and is hosted on Akamai with Adobe Experience Manager as its CMS, indicating a mature digital infrastructure. However, the current SSL configuration is invalid, and no modern TLS protocols are enabled, which significantly impacts the security posture. Privacy and cookie policies are present and compliant with GDPR, and the site employs multiple analytics and marketing tools. Overall, the site is trustworthy and credible but requires urgent remediation of its SSL and TLS configurations to improve security and user trust.

Scanned

This is an earlier scan of tmobile.com. View the latest report

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 operates as an enterprise-level telecommunications company targeting both consumer and business segments in the US and Puerto Rico. Its business model revolves around direct sales of wireless plans, devices, and home internet services, supported by a strong brand and extensive marketing ecosystem. The company leverages multiple subsidiaries and partner domains to extend its service offerings, including prepaid services, business solutions, and financial products. The website reflects a well-established market presence with clear navigation, rich content, and strong customer engagement through social media and support channels. The domain's 25-year age and consistent WHOIS data reinforce the company's legitimacy and stability in the market.

Security posture

The website demonstrates some security best practices such as the use of HSTS with includeSubDomains and preload, Content-Security-Policy restricting frame ancestors, and X-Content-Type-Options set to nosniff. However, the absence of a valid SSL certificate and lack of enabled TLS protocols (including TLS 1.2 and 1.3) are critical vulnerabilities that expose users to potential risks. Additionally, the site lacks OCSP stapling and session resumption features, which could affect both security and performance. No known vulnerabilities like Heartbleed or POODLE are detected. The security score is low due to these critical SSL/TLS issues, and immediate remediation is recommended to restore trust and secure communications.

Recommendations

  1. Immediately fix the SSL certificate to ensure it is valid and properly configured.
  2. Enable modern TLS protocols (TLS 1.2 and TLS 1.3) to secure data in transit.
  3. Implement OCSP stapling and session resumption to improve security and performance.
  4. Regularly review and update security headers and policies to maintain best practices.
  5. Enhance transparency by publishing a dedicated security policy and incident response information.
Technical notes

Notes

The website is built on a robust technical infrastructure using Adobe Experience Manager as the CMS and Akamai as the hosting and CDN provider. It employs modern JavaScript frameworks like Alpine.js and integrates multiple third-party services for analytics, marketing, and customer engagement including Adobe Launch, Qualtrics, OneTrust, Invoca, and LivePerson. The site is well-optimized for mobile devices and accessibility, with good SEO practices evident in meta tags and structured data. Performance is moderate, with some room for improvement. The invalid SSL configuration is a significant technical risk that must be addressed promptly to avoid user trust issues and potential data interception.
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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