iPhone hotspot to another phone: why it keeps dropping
Most guides about iPhone tethering assume you’re connecting a laptop. Plenty of people aren’t. They’re connecting another phone.
The setup is everywhere once you notice it. One phone carries the data plan, a second phone has no SIM, no data left, or a plan the owner is trying not to touch. A work phone and a personal phone. A parent’s phone and a kid’s phone. An old iPhone kept as a music player. A dual-phone setup where only one line has a decent package.
It works. Then it stops working, usually faster than a laptop would.
There’s a specific reason for that, and it isn’t the one people expect. Two devices are going to sleep, not one. Fixing only the iPhone that shares the connection solves half the problem, which is why so many people say they tried everything and it still drops.
Connecting a second phone in the first place
Nothing exotic here. The receiving phone just joins a Wi-Fi network.
On the iPhone doing the sharing, open Settings → Personal Hotspot, turn on Allow Others to Join, and note the Wi-Fi password. On the second phone, open the Wi-Fi list, pick the iPhone’s name, type the password.
Two things that trip people up:
Stay on the Personal Hotspot screen while the other phone connects. iOS switches the hotspot off on its own if nothing joins within about 90 seconds, and hunting through a second phone’s settings takes longer than you think. Keeping that screen open holds it available.
An iPhone with no SIM connects perfectly well. A retired iPhone with no active line still joins Wi-Fi networks normally, hotspots included. There is no cellular requirement on the receiving side.
iPhone to Android
Works exactly the same. The Android phone sees a normal Wi-Fi network and joins it with the password. There is no Apple restriction here, no compatibility layer, nothing to install.
If the Android phone doesn’t see the network at all, turn on Settings → Personal Hotspot → Maximize Compatibility on the iPhone. That moves the hotspot from 5 GHz to 2.4 GHz, which budget and older Android phones detect far more reliably.
iPhone to iPhone
Also straightforward, with one shortcut: if both iPhones are signed into the same Apple ID, the second one shows your iPhone under a separate Personal Hotspot heading in its Wi-Fi list and connects without a password.
Different Apple IDs, which is the normal case for two people, means typing the password like any other network.
Why it drops faster than a laptop does
Here is the part that actually matters.
When a laptop is tethered and the connection dies, there is one culprit: the iPhone put its cellular radio to sleep because the phone went idle. That’s the well-known problem, and we cover it in depth in why your iPhone hotspot keeps disconnecting.
When a phone is tethered, you get that plus a second, independent failure on the receiving end. Phones are far more aggressive than laptops about power management, because they’re designed to survive a day in a pocket. A laptop with the lid open keeps its Wi-Fi radio awake. A phone in a pocket does not.
So the connection can break from either side, at different moments, for different reasons. People fix one, see the problem continue, and conclude nothing works.
Let’s take the two sides separately.
Side one: the iPhone sharing the connection
This is the sleep everyone knows about. When the sharing iPhone’s screen turns off and it sits idle, iOS powers down the cellular radio to save battery. Every connected device loses its network at that moment, phone or laptop, no difference.
There’s a second effect specific to this setup. Once the receiving phone drops off, the hotspot has zero connected devices, and iOS starts its 90 second auto-off countdown. A minute and a half later the toggle switches itself off entirely, so even when the second phone tries to reconnect, there’s nothing there. We wrote about that chain in why your hotspot turns itself off.
What half-works: setting auto-lock to Never on the sharing iPhone. It keeps the radio awake, and it drains the battery fast, because the screen becomes the biggest power draw while the phone is also running a Wi-Fi access point and a cellular modem. Fine for an hour at a desk with a charger. Not a solution for a phone in a bag.
What works properly: Hotspot Hero uses background location updates to keep the cellular radio responsive with the screen off. The sharing iPhone can be locked and in a pocket, and the connection holds. That’s the whole point of the app, and this two-phone setup is the case where it matters most, because you cannot reasonably keep two phones awake with their screens on.
Side two: the phone receiving the connection
This side gets almost no coverage anywhere, and it’s half the problem.
If the receiving phone is an Android
Android has several features that will deliberately drop a hotspot connection, and they’re all on by default on most phones.
Switch to mobile data automatically. Android watches the quality of the Wi-Fi connection and jumps to cellular when it judges Wi-Fi to be poor. On a hotspot that’s exactly backwards: it abandons the connection you want and, if the phone has no data, leaves it with nothing. Look for it under Settings → Network & internet → Internet → network settings, named something like Switch to mobile data or Adaptive connectivity. Turn it off. The exact wording varies by manufacturer, Samsung and Xiaomi both use their own.
Wi-Fi off during sleep. Some manufacturers, Xiaomi and older Samsung builds in particular, shut the Wi-Fi radio down when the screen has been off for a while. Search battery or Wi-Fi settings for a “keep Wi-Fi on during sleep” option and set it to always.
Battery optimisation on the connection. Aggressive battery savers restrict background network use per app. If the second phone is running something that needs a constant connection, exempt it from battery optimisation.
Private DNS or a VPN. Both can leave the Android phone showing a connected Wi-Fi with no working internet. Turn them off to test.
If the receiving phone is an iPhone
Fewer knobs, but two that matter.
Wi-Fi Assist. If the receiving iPhone has its own active SIM, Settings → Cellular → Wi-Fi Assist lets it abandon a weak Wi-Fi network and silently use its own cellular data instead. On a hotspot this both breaks the connection and spends data on a plan you were trying to protect. Turn it off.
Auto-Join. If the receiving iPhone has other saved networks nearby, it can wander off to one it prefers. Settings → Wi-Fi → tap the hotspot → Auto-Join on, and forget any networks it shouldn’t be choosing.
An iPhone with no SIM at all avoids the Wi-Fi Assist problem entirely, since it has no cellular to fall back to.
A setup that holds
Run through this once and the pair stays connected.
On the sharing iPhone:
- Set a memorable hotspot password in
Settings → Personal Hotspot - Turn on Maximize Compatibility if the second phone is an older or budget Android
- Install Hotspot Hero, tap Start, grant Location: Always
- Keep it charged. Sharing a connection is hard on the battery
On the receiving phone:
- Turn off Switch to mobile data or Adaptive connectivity (Android)
- Turn off Wi-Fi Assist (iPhone with a SIM)
- Keep Wi-Fi on during sleep (Android)
- Turn on Auto-Join for that network so it reconnects on its own
What this costs in data
Worth saying plainly, because this setup is most common exactly where data is most expensive.
A second phone connected all day is not a light load. Even with nobody actively using it, a modern phone syncs mail, refreshes apps, uploads photos, and checks for updates. Sitting idle on a hotspot, a phone can quietly use a gigabyte a week doing nothing you asked for.
Before handing a connection to a second phone, turn off automatic app updates and photo backup on that phone, or restrict them to real Wi-Fi. Our data usage calculator shows what the actual activities cost per hour, and the full breakdown of hotspot data costs covers the background drains that catch people out.
If the sharing phone is on a prepaid plan, also check whether your carrier counts tethered data separately from regular data. Many do, and hitting that limit looks exactly like a broken hotspot: the sharing phone still has internet, the second phone gets nothing.
Diagnosing which side broke
When it drops, this tells you where to look in about ten seconds.
| What you see | Which side | Go to |
|---|---|---|
| Drops right when the sharing iPhone’s screen turns off | Sharing iPhone | Radio sleep, install Hotspot Hero |
| Drops when the receiving phone’s screen turns off | Receiving phone | Wi-Fi sleep, adaptive connectivity |
| Hotspot toggle is off when you check | Sharing iPhone | 90 second auto-off after the client dropped |
| Connected, but no internet on the second phone | Neither, probably the plan | Connected but no internet |
| Second phone never sees the network | Band mismatch | Maximize Compatibility on |
| Worked all month, stopped suddenly | Carrier | Tethering cap reached |
The honest summary
Phone-to-phone tethering is not harder than laptop tethering, but it has twice the failure surface, and almost every guide online only addresses one half of it.
Fix the receiving phone’s power settings and you stop the drops that happen when that phone goes idle. Fix the sharing iPhone’s radio sleep and you stop the drops that happen when it goes idle. You need both, and the second one is the one no setting on the phone can solve, which is why Hotspot Hero exists.
Frequently asked questions
Can an iPhone hotspot connect to another phone?
Yes. The second phone joins the iPhone’s hotspot like any other Wi-Fi network, using the password shown in Settings → Personal Hotspot. It works with iPhones and Android phones equally, and the receiving phone does not need a SIM card or an active data plan of its own.
Can an Android phone connect to an iPhone hotspot?
Yes, with no restriction and nothing to install. The Android phone sees a standard Wi-Fi network. If it can’t find the network, turn on Maximize Compatibility on the iPhone, which moves the hotspot to the 2.4 GHz band that budget and older Android phones detect more reliably.
Why does my hotspot keep disconnecting from the second phone?
Because two devices can put themselves to sleep, not one. The sharing iPhone powers down its cellular radio when idle, and the receiving phone shuts down or abandons its Wi-Fi connection when its own screen is off. Fix the receiving phone’s power settings, then fix the sharing iPhone’s radio sleep with a background location app.
Can I use an iPhone with no SIM card on a hotspot?
Yes. A phone with no SIM joins Wi-Fi networks normally, and a hotspot is just a Wi-Fi network. This is how a lot of people keep an old iPhone useful as a second device, and it has the side benefit that the phone cannot quietly fall back to cellular data it doesn’t have.
How do I stop my Android from switching off the hotspot to mobile data?
Turn off the setting variously called Switch to mobile data, Adaptive connectivity, or Auto switch to mobile network, usually under Network and internet settings. It exists to leave weak Wi-Fi networks automatically, which on a hotspot means abandoning the connection you actually want.
Does sharing my hotspot with another phone use a lot of data?
More than people expect. Even idle, a connected phone syncs mail, refreshes apps and uploads photos, which can quietly run to a gigabyte a week. Turn off automatic app updates and photo backup on the second phone before connecting it, and check whether your plan counts tethered data separately.