Mobile Security for Business: What to Protect on Staff Phones

Business email, Teams, cloud files and line-of-business apps increasingly live on phones. That makes mobile security part of business security, even when the phone itself is personally owned.

Decide what devices may access business data

Separate company-owned managed devices from BYOD. If personal phones are allowed, define what access is permitted and which controls the business can apply to work data.

Keep devices supported and updated

Unsupported phones and long-delayed operating-system updates create avoidable risk. Business access should not depend on devices that can no longer receive security fixes.

Use MFA and protect the device itself

Require a strong device lock and appropriate MFA for business accounts. A phone with business sessions already open is valuable even if the attacker never learns the password.

Control business applications and data

Managed application policies can limit copying, saving and sharing business information into unmanaged personal apps without requiring the business to take over the entire personal device.

Have a lost-device process

Staff should know who to contact immediately if a work phone or a phone with business access is lost. The response may include revoking sessions, removing work data, blocking access and checking recent sign-ins.

Our separate guide, Your Work Phone Just Went Missing, covers the incident-response steps. For the wider control baseline, use the Security Self-Check.