iPhone 5G+ connectivity issue after screen replacement and iOS upgrade

Little bit of a weird issue but on march 31 I got my screen replaced and they also upgraded my phone to IOS 18.4 and since then I noticed it right away on the drive home that my phone was not going to 5G+ anymore, I checked my other phone which was on 5G+ in the same location.


I went back to apple the next day and they told me that they ran diagnostics and everything came back fine and they said its just bad reception. I asked the apple tech what phone he has, carrier and ios of his phone. he has the same carrier, same iPhone but hes on ios 18.3.2 so not bad reception.


I tried to downgrade to ios 18.3.2 since its still signed my apple but it failed twice and I had to reset my phone (reset didn't fix the issue)


Can I get some help with how I should proceed? I tried my sim card in my old iPhone 12 and I've tried different carriers too. My phone is refusing to go to 5G+



[Re-Titled by Moderator]

iPhone 16 Pro Max, iOS 18

Posted on Apr 4, 2025 8:18 AM

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Apr 4, 2025 2:14 PM in response to taman66

Edit: OK looks like there is a mmWave antenna in the 16 series outside of the US. I wasn't aware of that change.


Makes me wonder if something didn't get reconnected properly when the screen was replaced.


I'd take it back to Apple.



I'm a little confused... 5G+ requires a MMWave antenna. Only US market devices have a MMWave antenna as far as I know.


Where did you originally get the phone? Who is your carrier? I wasn't aware of ANY carriers in Canada offering 5G+ service.

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Apr 4, 2025 2:53 PM in response to Jeff Donald

I just walked out of the apple store they checked in the phone. They couldn't get the phone to get connected to 5G and they tried my sim card in 2 different test units and they went to 5G+ right away.


They checked it in and are going to try to do a logic board replacement. Hopefuythag fixes it.



I have a physical and Esim in the phone. Physical is with Rogers and Esim with Bell.

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iPhone 5G+ connectivity issue after screen replacement and iOS upgrade

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