iPhone Air hotspot not working? The eSIM angle explained

Personal Hotspot on the iPhone Air is the same feature it is on every other iPhone. Same settings screen, same five-device Wi-Fi limit, same Bluetooth and USB options, same idle disconnection. Nothing about the hardware changes how tethering works.

What does change is the failure mode. The iPhone Air is eSIM only, and that single fact accounts for most of the hotspot complaints people have with it. When tethering breaks on a phone with a SIM tray, you have options: pull the card, put it in another phone, test whether the problem follows the line or stays with the device. On an eSIM-only phone none of that exists. You are entirely dependent on your carrier provisioning things correctly, and when they don’t, the hotspot is the first feature to disappear.

This guide covers what actually goes wrong, in the order it goes wrong.

Why eSIM-only makes hotspot fragile

Personal Hotspot is not purely a software switch. Tethering is a carrier entitlement: a permission your network operator attaches to your line and pushes to the device as part of the carrier profile. If that entitlement does not arrive, iOS greys the option out or hides it entirely, no matter how new the phone is.

On a physical SIM, the card carries an identity that the network recognises the moment it is inserted, and the carrier profile follows. With eSIM, the whole thing is a provisioning transaction between your carrier’s systems and the device. That transaction can partially succeed. Calls work, data works, and the tethering entitlement lags behind or never lands at all.

That is the single most common reason an iPhone Air shows a greyed-out Personal Hotspot while everything else about the line looks fine.

Fix one: force a carrier profile refresh

Work through these in order. The first three take under a minute and resolve most cases.

1. Restart the phone. Genuinely. A surprising share of post-activation eSIM glitches clear on a power cycle, because iOS re-reads the carrier profile on boot.
2. Toggle the line. Settings → Cellular → tap your line → turn it off, wait 10 seconds, turn it back on. This forces iOS to renegotiate with the network and pull a fresh profile.
3. Check for a carrier settings update. Settings → General → About, then wait a few seconds on that screen. If a prompt appears, install it.
4. Ask the carrier to re-push the entitlement. If the first three fail, call support and use this wording: “Personal Hotspot is missing on my device. Can you re-provision the tethering entitlement on my line and push a fresh carrier profile?” That phrasing gets you past the first-line script much faster than saying the hotspot is broken.

If Personal Hotspot is greyed out rather than missing, our seven causes of greyed-out Personal Hotspot covers the other six reasons, most of which apply to the iPhone Air unchanged.

Fix two: check which line the hotspot is following

The iPhone Air supports more than one eSIM profile, and this is where people trip.

Tethering follows the data line, not whichever line you used last. If you have a home eSIM and a travel eSIM installed, and Personal Hotspot is not working, confirm that the line you expect to share is the one currently set as your cellular data line in Settings → Cellular.

Two common versions of this:

• You added a local eSIM abroad, it became the data line, and that plan does not include tethering. Your home line does, but it is no longer the one sharing.
• You have a work eSIM with a corporate profile that blocks tethering, and it silently became the data line after a reboot.

Switch the data line and retest before assuming the device is at fault.

Fix three: the transfer from your old phone

If hotspot worked on your previous iPhone and stopped the day you moved to the Air, the transfer is the suspect, not the phone.

Moving an eSIM to a new device is a fresh provisioning event on the carrier side. The line activates, calls and data come back, and the tethering entitlement is re-issued separately. There is often a gap of minutes to hours, and occasionally it needs a manual nudge from support.

The other half of transfer trouble is on your laptop, not your phone. A new iPhone generates a new random hotspot password during setup, so every device that had the old phone saved will fail to connect with a cached password that is now wrong. Forget the network on each device and rejoin. Details in our hotspot password guide, and the full transfer checklist is in iPhone 18 hotspot.

Battery: the part that actually differs

Here is the one place where the Air being the Air genuinely matters, and it has nothing to do with eSIM.

Tethering is the heaviest sustained load you can put on a phone. The cellular modem runs at full power while the device simultaneously operates as a Wi-Fi access point. Both radios, continuously, for as long as something is connected.

A thinner phone has less internal volume for a battery than a larger one in the same generation. That is not a criticism of the design, it is physics. The practical consequence is that the iPhone Air will drain faster while sharing a connection than a physically larger model will, doing exactly the same work.

What this means in practice:

• Plug in for anything longer than about half an hour. This is good advice on any iPhone and better advice here.
• Do not use auto-lock set to Never as your way of keeping the hotspot alive. It is the worst possible option on a thin phone, because the screen becomes the single largest power draw on top of two radios already running hard.
• Use USB tethering at a desk. A cable is faster, more stable, and charges the phone while it works. It removes the Wi-Fi access point from the equation entirely.

The dropping problem is unchanged

To be clear about what the iPhone Air does not change: when the screen turns off and the phone goes idle, iOS powers down the cellular radio to save battery, and every tethered device loses its connection within seconds.

That behaviour comes from iOS power management, not from the modem, the chip or the chassis. It has been consistent across every iPhone model and every iOS release since iOS 14. A new model does not fix it, and on a phone with tighter battery headroom the system has, if anything, more reason to be aggressive about it.

The reliable fix is the same one it is on every other iPhone: an app that uses the Core Location background API to keep the cellular radio responsive while the screen is off. That is what Hotspot Hero does, and because it relies on APIs Apple has kept stable for over a decade, the device model changes nothing about how it works. Install it, tap Start, grant Location: Always.

The full technical explanation is in why your iPhone hotspot keeps disconnecting.

Setup checklist for a new iPhone Air

1. Confirm Personal Hotspot appears in Settings. If it does not, run the carrier profile refresh above before anything else.
2. Confirm the right eSIM is your data line if you have more than one installed.
3. Set a memorable hotspot password so you are not typing a random string into a console or a colleague’s laptop.
4. Decide on Maximize Compatibility: off for modern laptops and faster speeds, on if you tether consoles, TVs or older devices. See why your hotspot is slow.
5. Forget and rejoin the hotspot on every laptop, tablet and console, since the password changed with the new phone.
6. Install Hotspot Hero and grant Location: Always, fresh on the new device. Permissions restored from a backup are not dependable for location apps.
7. Keep a cable handy. On a thin phone, USB tethering is the better default at a desk.

Frequently asked questions

Why is Personal Hotspot not working on my iPhone Air?

Almost always because the tethering entitlement has not provisioned on your eSIM. The line activates and data works, but the carrier permission that enables hotspot arrives separately and sometimes never lands. Restart the phone, toggle the cellular line off and on, install any carrier settings update, and if it persists ask your carrier to re-push the tethering entitlement.

Does being eSIM only cause hotspot problems on the iPhone Air?

Indirectly, yes. The feature itself is identical, but eSIM provisioning is a transaction with your carrier that can partially succeed, leaving calls and data working while tethering stays unauthorised. With no SIM tray you also cannot move the line to another phone to test whether the problem is the device or the account.

Why did my hotspot stop working after switching to the iPhone Air?

Moving an eSIM to a new device is a fresh provisioning event, so the tethering entitlement has to be re-issued and there is often a delay. Separately, the new phone generated a new random hotspot password, so every laptop and tablet that had the old phone saved will fail to connect until you forget the network and rejoin.

Does the iPhone Air drain battery faster when used as a hotspot?

It will drain faster than a physically larger phone doing the same job, because a thinner chassis leaves less room for a battery while tethering runs both the cellular modem and a Wi-Fi access point continuously. Plug in for sessions longer than about half an hour, and prefer USB tethering at a desk.

Does the iPhone Air fix the hotspot dropping when the screen locks?

No. That drop comes from iOS powering down the cellular radio when the phone is idle, which is software behaviour unchanged across every model and every iOS version since iOS 14. The fix is an app that keeps the radio responsive through background location updates, and it works the same on the iPhone Air as on any other iPhone.

Can I use two eSIMs and share the hotspot from either one?

Personal Hotspot follows whichever line is currently set as your cellular data line, not whichever line you used last. If you have two profiles installed, check Settings and Cellular to confirm the sharing line is the data line. A travel or work eSIM that does not include tethering will block hotspot while it holds that role.

The short version

The iPhone Air does not change Personal Hotspot. It changes how you diagnose it.

With no SIM tray, every problem routes back through your carrier’s provisioning, so the first move on any hotspot fault is a carrier profile refresh rather than a hunt through iOS settings. And with less battery headroom than a larger phone, the old trick of leaving the screen on to keep the connection alive is a worse idea here than anywhere else. Hotspot Hero keeps the radio awake without the screen, which is exactly the trade a thin phone needs.