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Riccardo Corbari
User level: Level 2 (155 points)

iPhone 18 Pro Max has Wi-Fi connection and slow data transfer issues

Hello,

I received a new iPhone 18 Pro Max (512 GB) on Friday, purchase at Apple online store.

iOS 27.0

Since the beginning, I noticed WiFi issues: the device can connect to WiFi networks, but cannot make traffic (no data at all – as it'd be connected to a network without internet connection – or very slow data transfer).

I tried to talk several times with Apple support, with no luck. The first of them also said that he did a remote check of the WiFi module and it resulted OK.

I made several tests on my local home network (Fritz!Box 7590), pinging both the new iPhone 18 Pro Max and my old 15 Pro Max: 18 Pro Max lost up to 85% of packets (and no tests had 0% loss) while the 15 Pro Max (in the same moment) had 4 tests with 0% loss.

I also tried another WiFi network (in a restaurant) where connection was way too slow; and I tried to make hotspot on the iPhone 15 Pro Max (connecting to the hotspot from the 18 Pro Max) and speed seemed OK (despite I made just one test before to move that eSIM to the new phone).

Is there anyone experiencing the same issues on the new iPhone 18 Pros?

Do you have any idea on which could be a solution to avoid to return the phone, waiting more than 1 month to receive a new one?

Just after posting this topic, I'll try to install the beta release, just to check if it could be a software issue (and, in that case, if Apple noticed it and solved in the new beta...).

Any help would be very appreciated, thanks!

Posted on Sep 21, 2026 6:56 AM

2 replies

GSYoung
User level: Level 2 (181 points)

Sep 21, 2026 7:26 AM in response to Riccardo Corbari

While I have no solution for your issue, I can say that my iPhone 17 pro which has the same N1 network chip as the iPhone 18 developed connectivity problems when I upgraded to iOS 27. My phone connected to both my 5Ghz and 2.4 Ghz radios just fine on iOS 26, but with iOS 27, it would not connect at all to 5 Ghz radios and defaulted back to the slower 2.4 Ghz radio. I tried everything I could think of and recommendations I found online, but the only fix for me was to revert the phone back to iOS 26 (26.6.2) and restore from backups. Its connectivity issues resolved once back on iOS 26 and the wifi speeds are back accordingly. I don't know, but I suspect there may be compatibility issues with some devices and phones using the N1 network chip and iOS 27.

Louis__since2022
User level: Level 1 (108 points)

Sep 22, 2026 2:29 AM in response to Riccardo Corbari

Seems to me a bad configuration of the WiFi if you had okay speeds on a hotspot, I noticed also that IOS27 introduced connectivity assist that uses data too, I suggest you to turn that off and try to reboot your modem, I mean for me the WiFi points out as the issue

Originally posted at discussions.apple.com/thread/256361941