EE

• Security advice for your phone:
  https://www.ee.co.uk/help/security/staying-safe-online/security-advice-for-your-phone

• Online security hints and tips:
  https://www.ee.co.uk/help/security/staying-safe-online/online-security-hints-and-tips

• Set Up Safe (child-friendly controls):
  https://www.ee.co.uk/help/security/staying-safe-online/set-up-safe-manage-childs-phone

O2

• Mobile & device security (PIN, SIM safety, lost/stolen guidance):
  https://www.o2.co.uk/help/safety-and-security/device-security/mobile-security

Three UK

• Stay safe online (fraud, scams, content filtering, privacy):
  https://www.three.co.uk/privacy-safety/stay-safe-online

Vodafone UK

• Mobile safety & security advice (via industry guidance):
  https://www.mobileuk.org/advice-for-consumers-copy

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Trusted Security Organisations

• NCSC (National Cyber Security Centre
  Device Security Guidance Collection: https://www.ncsc.gov.uk/collection/device-security-guidance

• Keeping smartphones and tablets safe: https://www.ncsc.gov.uk/collection/small-business-guide/keeping-your-smartphones-and-tablets-safe

• ICO (Information Commissioner’s Office)
  Smartphone security advice: https://ico.org.uk/for-the-public/online/smartphone-security/