What you will achieve

Use your iPhone’s Personal Hotspot to get your Mac online when Wi‑Fi is unavailable.

Personal Hotspot turns your iPhone cellular data into a Wi‑Fi, Bluetooth, or USB modem for Mac. Instant Hotspot uses the same Apple ID trust chain as Handoff. Carrier plans and iOS Low Power Mode can silently disable hotspot — check both ends.

1) Enable on iPhone

Settings → Personal Hotspot — allow others to join.
Note the Wi‑Fi password.
Keep Bluetooth and Wi‑Fi on for Instant Hotspot; Cellular must be enabled.

2) Connect from Mac

Wi‑Fi menu — select your iPhone; enter password if asked.
Instant Hotspot — same Apple ID, Bluetooth on both devices; iPhone appears without password in Wi‑Fi list.
USB — plug iPhone in, trust computer, select iPhone in Network settings for charging+data.

3) iCloud and carrier limits

Some carriers throttle hotspot data or require a plan add-on. Monitor usage on iPhone. Low Power Mode on iPhone can disable hotspot.

4) Troubleshooting

Toggle Personal Hotspot off/on.
Disable and re-enable Wi‑Fi/Bluetooth on both devices.
Sign out/in iCloud if Instant Hotspot never appears.

5) Security

Use a strong hotspot password. Disconnect when finished on untrusted networks nearby.

6) USB tethering throughput

USB-C to Lightning or USB-C to USB-C tethering often beats Wi‑Fi hotspot latency for video calls — enable in Personal Hotspot settings on iPhone 15+ models. Mac shows iPhone USB in Network service list.

7) Carrier tethering caps

Some plans zero-rate mobile data but count hotspot separately — watch iPhone Settings → Cellular → Personal Hotspot data. Enable Low Data Mode on hotspot if you only need email, not 4K streaming.

8) Mac-side metered hint

Third-party tools can warn on large downloads over hotspot — macOS does not fully meter iPhone tether the way Windows does. Pause iCloud Photos sync before tethering large libraries.

Verify

Mac shows connected; browse works; iPhone status bar shows hotspot active.

Additional troubleshooting notes

If steps above do not resolve the issue on the first attempt, reboot once, confirm System Settings → General → Software Update is current, and retry with a second administrator account to rule out profile or keychain corruption in your daily user. Document exact error text from Console.app with timestamp — vague “it still fails” without logs wastes support time. On Apple Silicon, re-test after full shutdown (not just restart) because firmware and Thunderbolt controllers reset only on cold boot. Intel Macs should repeat test in Safe Mode to bypass third-party login items. Before erase or keychain reset, verify Time Machine or clone backup completed — batch 3 guides assume Monterey/Ventura/Sonoma/Sequoia paths in System Settings; search Spotlight for renamed panes if your macOS version labels differ slightly.