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From: Your Name <YourName@YourISP.com>
Newsgroups: misc.phone.mobile.iphone
Subject: Re: Does your iPhone's Internet sometimes stop working?
Date: Sun, 2 Mar 2025 12:34:07 +1300
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On 2025-03-01 22:19:57 +0000, Rick said:
> On 3/1/2025 2:37 PM, Ant wrote:
>> Hello,
>> 
>> Does your iPhone's Internet sometimes stop working? I tried turning off
>> its cell and wifi, and then turn on and off its airplane. That doesn't
>> fix it. I reboot my iPhone 12 mini (updated iOS), and that fixes it. I'm
>> wondering if you guys also run into this very rare issue too.
>> 
>> Thank you for reading and hopefully answering soon. :)
> 
> It happens occasionally.  I always assumed it was because the internet 
> router changes its IP address every now and then and the iPhone may not 
> adjust quickly without a reboot.  It eventually gets there.

Depends if it internet connection is via the cellphone system or a 
wireless router at home / work.

There does seem to be a problem with some routers (especially the cheap 
ones given out by telecoms companies) when a device goes to sleep, the 
connection is lost and locked by the router, then when the device 
reawakes trying to use the same network address, it fails because the 
modem says the address is "in use" with another device. The same can 
happen with other devices connected via wi-fi and even ethernet cables, 
such as a MacBook Pro or printer.

Sometimes rebooting the device and / or rebooting the router works, by 
forcing the router and device to get a new network address. Sometimes 
giving the device a fixed network address can be a more permanent fix, 
but may not be practical for all devices.