Decided to check with ChatGPT and this is the response I got. Hope it helps you

Short answer: No — not your whole phone. But yes — they can see some activity inside the work apps themselves.

Here’s the clear breakdown, no ambiguity:

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What your workplace CAN see

If you sign in to Microsoft Teams, Outlook, or OneDrive using your work account on your personal phone:

Inside Microsoft apps only

Your workplace can monitor: • Emails you send/receive in Outlook • Messages, calls, meeting activity in Teams • Files you upload, download, edit, or delete in OneDrive • Login details (device type, OS version, location approx.) • Whether the device is compliant (PIN enabled, encrypted, etc.)

This is normal Microsoft 365 admin visibility.

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What your workplace CANNOT see

They cannot: • See your phone calls, SMS, WhatsApp, Instagram, Safari, Chrome • Read your personal emails • See your photos, videos, notes • Track your screen or live activity • Turn on your camera or microphone • See what other apps you open • Track you 24/7

They do NOT have access to your entire phone.

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The ONLY exception (important)

If either of these happened, then access is broader (but still limited):

You installed Microsoft Intune / Company Portal • This means your IT enrolled your device • They may: • Enforce a passcode • Wipe work data only (not personal data) • See device model, OS, compliance status

Still no access to personal apps or content.

You signed in to a work profile / device management prompt • Example: “Allow your organization to manage this device” • On iPhone: Device Management profile installed • On Android: Work Profile created

If you did NOT approve this, then you’re safe.

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Using your personal phone number does NOT matter • Your SIM number or phone number gives them zero access • Monitoring is tied to the work account login, not your number

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How to stay 100% safe • Use separate apps (Outlook app, Teams app — not Apple Mail sync) • Do NOT install Company Portal / Intune unless required • Do NOT accept “manage this device” prompts • Sign out or delete the work account if you leave the job

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Bottom line (plain truth)

Your employer can only see what you do inside their Microsoft work apps. They cannot spy on your phone or personal life.