Cellular connection lost on iPhone 15 with T-Mobile eSIM

Question

Cellular connection lost on iPhone 15 with T-Mobile eSIM

I have a esim from Tmobile for US. My wife and I are in the same situation and her phone (iphone 13) works perfectly fine. My phone (iphone 15) all of a sudden started doing this: “ It will take hours to connect to the cellular data, and when it loses the signal, it goes back to SOS and stays there. It jumps to Edge network every now and then, loses the signal again, and will not connect for another couple hours. So I’m without coverage 75% of the time. Did pretty much all resets except the factory reset. Asked t mobile to take a look, they installed the esim twice. Apple Genius cannot find anyting wrong with the hardware. Software up to date. Any ideas?”

[Re-Titled by Moderator]

Original Title: Cellular Connection Lost

iPhone 15 Plus, iOS 18

Posted on Jul 20, 2025 2:24 PM

Reply

Answer 1

Jul 20, 2025 2:34 PM in response to metinaslantas

If you have any add-on VPN apps, or add-on security apps, remove all, restart, and check again.

Then if problems persist, have with a discussion with T-Mobile, and then with Apple Support.

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Answer 2

Jul 20, 2025 3:05 PM in response to MrHoffman

Thanks. I have SEP mobile and Microsoft Intune installed per my company policy. I’m thinking this is what you are referring to? I have a physical SIM (from another country ) and it works fine (roaming). What is peculiar is that it used to work fine. Last trip outside US, came back. Boom

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Answer 3

Jul 20, 2025 3:52 PM in response to metinaslantas

Contact your IT group for assistance. They created that configuration, and they own support, including any coordination with third-party app providers and vendors.

To borrow a phrase, past performance of enterprise gear is not indicative of current or future results.

Yes, I deal with enterprise networking, and with enterprise security. There are days when I wonder how it even works at all.

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Answer 4

Jul 28, 2025 6:55 PM in response to MrHoffman

Hi, it got very interesting. Per your advice I reinstalled the Symantec sec app. Things were OK. I flew from LA to Miami, everything worked fine there. Two days later flew to NYC. Phone works in Brooklyn but loses signal in Manhattan. It’s ridiculous. If somehow I lose the signal in a dead zone the phone will not pick up the signal in certain areas.

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Answer 5

Jul 28, 2025 7:13 PM in response to metinaslantas

Re-contact your IT organization.

Ask them if you should remove the add-on security entirely and test again, using the built-in anti-malware.

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