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Why does Wi-Fi calling fail without cell signal on iPhone SE?

My residence has inconsistent cell signals but good Wi-Fi. I have Wi-Fi calling set, my phone carrier supports it, but if cell service drops completely I can't make or receive phone calls. The Apple Support wi-fi calling page suggests this should work, but in two calls I have gotten different answers. One said it doesn't work that way: no cell signal = no call service. The other said Wi-Fi calling *should* work without cell service but offered no help on *making* it work.

Suggestions, anyone?

[Re-Titled by Moderator]

iPhone SE, iOS 18

Posted on Feb 14, 2025 8:07 AM

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Mag_Wheels Author

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Posted on Feb 15, 2025 12:31 PM

That is correct. I didn't try Airplane Mode until earlier today. Why not? Based on my own observation that no cell signal = no WiFi call capability, an Xfinity Mobile support agent telling me the same thing, and your own strong declarative statement that it worked that way, the LAST time I'd expect Wi-Fi calling to succeed is when the cell radio is turned off in Airplane Mode.

But it does. I've tried it with several incoming and outgoing calls on multiple different Wi-Fi networks and it works reliably.

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Mag_Wheels Author

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Feb 15, 2025 10:48 AM in response to Bob Timmons

That's what I thought. Airplane Mode turns off cellular service.

So ... if my cell radio is off in Airplane Mode, and Wi-Fi calling *requires* a cellular connection to set up the call, how and why do my calls go through?

Bob Timmons

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Feb 15, 2025 11:23 AM in response to Mag_Wheels

So, back to your original question.

Are you now saying that if you put your phone in AirPlane Mode.....so you don't have an active cellular connection......that calls go through?

You told us originally that calls would not go through unless cell service was active.

Bob Timmons

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Feb 15, 2025 12:41 PM in response to Mag_Wheels

Appears that you have solved your issue.

If I don't have a cell signal, I can't make or receive a call, no matter whether Wi-Fi Calling is enabled or not. My neighbor....who works for AT&T....says the same.

So, you must have a magical carrier who can do things that Apple says you cannot do. Congrats on that.

Bob Timmons

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Feb 15, 2025 1:27 PM in response to Jeff Donald

The AT&T doc says "most" cell phones since 2015 should work, and our iPhone 11 Pros are on the list of compatible devices.

I will be updating both phones tonight to iOS 18.3.1, so we can check the iOS off the list later.

Mag_Wheels Author

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Feb 15, 2025 2:52 PM in response to Bob Timmons

The "turns off everything but Bluetooth" statement is no longer true. Wi-Fi is now handled the same way as Bluetooth in Airplane Mode. The support page you linked says exactly that, further down in the text. My guess is that the technical information was updated but they forgot to change the title.

My remaining issue now appears to be an inability to send and receive calls when the cell signal is extremely weak and the phone should be using Wi-Fi but isn't. It's hard to tell whether Apple or the carrier is at fault.

Feb 15, 2025 5:37 PM in response to Mag_Wheels

Text messages are sent and received in the US on the 800 MHz band. These frequencies are used on 3G, 4G and 5G networks. The general advantage is the 700, 800 and 900 frequencies (used around the world for texts) can penetrate buildings, elevators etc. This is a huge advantage in large urban areas. Rural areas suffer some because those frequencies are line of sight and not well suited for mountainous areas and irregular terrain. In good conditions the 800 MHz bands can travel upwards of 50 miles.

Mag_Wheels Author

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Feb 16, 2025 7:56 AM in response to Bob Timmons

Happy it worked for you.

The high-level feature design is actually pretty simple - it's voice-over-IP calling with "mobile device on Wi-Fi" replacing "VoIP desk phone on Ethernet" - though the phone and carrier both have to implement it and I'm sure there were details to work out.

Mag_Wheels Author

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Feb 17, 2025 6:41 AM in response to Mag_Wheels

One other note. My wife's phone (an XR) was unable to do Airplane Mode wi-fi calling last week. Saturday it restarted and picked up the iOS upgrade to 18.3.1, and now that call mode works.

No, I don't know what's going on either.

SravanKrA

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Feb 14, 2025 8:10 AM in response to Mag_Wheels

This may help you understand --> WiFi Call is a Carrier Specific feature - Apple Community

Mag_Wheels Author

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Feb 15, 2025 7:46 AM in response to Jeff Donald

Interesting! The plot thickens ...

FYI, I activated Wi-Fi calling on my iPhone (SE 2nd gen) simply by contacting my carriers (first Verizon, then Xfinity Mobile) and asking for it.

Mag_Wheels Author

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Feb 15, 2025 8:15 AM in response to Bob Timmons

Thanks.

This is exactly why I haven't dropped this and moved on. SO MUCH inconsistent information out there.

Bob Timmons

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Feb 15, 2025 10:49 AM in response to Mag_Wheels

Mine don't. I don't know why yours do.

Feb 15, 2025 12:47 PM in response to Bob Timmons

Did you follow my link to AT&T website? The website says you don’t need a cell connection to use WiFi calling.

Feb 15, 2025 1:17 PM in response to Bob Timmons

I’ll try an Xr I have. That may be the issue.

Feb 15, 2025 1:35 PM in response to Bob Timmons

I just saw that. I think you’re on to something.

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Why does Wi-Fi calling fail without cell signal on iPhone SE?