Problem with 5GHz Wifi on iPhone 12 Pro

Greetings, FrostbiteXX.

Congratulations on your new iPhone 12 Pro!

It appears that you're having a problem with your iPhone 12 Pro, however. When it's connected with your home's 5GHz Wi-Fi network, applications won't download, you can't play songs in your Apple Music library, and photos won't sync either way. Good job on discovering that it works fine on the 2.4GHz network and the troubleshooting you've done as well. We're glad to help with this.

Recommended settings for Wi-Fi routers and access points - Apple Support -- These are the recommended settings for your Wi-Fi router. If you don't manage your home's Wi-Fi network, ask the one who does or contact your ISP for help.

If your iPhone, iPad, or iPod touch won’t connect to a Wi-Fi network - Apple Support -- If your iPhone still won’t work on your 5GHz network, the steps in this article can help. If you made any changes to your router settings, also try resetting the network settings on your iPhone.

Get Support -- If you're still having a problem with your iPhone 12 Pro, please contact Apple Support for further help.

Cheers!

This seems simple enough to test:

Manually set your DNS server address to that your phone is normally assigned via DHCP and/or to your router's address.

What you will likely see is speeds change depending upon the DNS address you set, not on whether the DNS address is set via DHCP or not.

Exact same issue on iPhone 12 Mini.

Works fine on 2.4 GHz but unable to sync iCloud or load media content on 5GHz. The console reports a lot of URLSesison Timeouts.

Norwegian Altibox customer as well with the Zyxel FMG fiber router. Requested a firmware update, but it didn't help.

Will look into replacing it (the router).

Hello,

So I've experienced a similar issue today with my iPhone 12 Pro. I couldn't connect to my WiFi at all! I tried a hard reset on my iPhone, reset my network settings, and turned off my cellular data. Nothing was working! Very frustrating...

What I did end up doing which quickly fixed this was turning on my VPN application which immediately enabled my WiFi and then I just turned the VPN off.

WiFi still works. Hopefully this helps anyone else encountering the same problem.

~Rob

EDIT: I noticed others have discovered this solution after posting this and scrolling up. Hopefully the issue will be addressed soon via and update.

But they might not know that Private Address even exists, or that MAC filtering was enabled so long ago (or by someone else) that they forgot about it. As I’ve been in a number of threads where turning of private address fixed the problem I usually suggest it first.

I haven’t heard of this problem with the iPhone 12. In some older models it meant that the radio chip had failed. As the phone is still in warranty use the Get Support link at the top of this page to discuss diagnostic and repair options with Apple.

If manually specifying DNS settings sped things up, that usually indicates an issue with the DNS service provided by your ISP.

This is because your ISP makes no additional revenue if their DNS servers are fast, so it's often one of the most overlooked pieces of their infrastructure.

I often tell people to try something like Google's DNS servers and see whether it makes a difference in the speed of their Internet browsing.

Just upgraded my xFi router to their 3rd Gen router and it’s now working.

Thank you but a simple recommendation of resetting the router did the trick.

Lawrence Finch wrote:

Go to Settings/Wi-Fi, tap on the i next to the network name, and turn off Private Address.

That literally should make no difference unless his router is broken.

Raven_braglin1819 Said:

"Problem with 5GHz Wifi on iPhone 12 Pro"

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Report this to Apple:

Do Your Part: This seems to be a common occurrence. So, let Apple know of this via their feedback page - they won't get back to you directly, but the more feedback they receive on this, the more they will know what is going on. Let Apple know which settings work and which don't, when this began, and how you have troubleshot it thus far.

How to Give Feedback on This:

1. Go Here: Feedback - iPhone - Apple
2. Select: "Bug Report" for the "Feedback Type"
3. Proceed from there as necessary.

Got a new iPhone12 this week and i see the same issue.

No wifi issue:- 2.4Ghz or 5Ghz (low channel like 36Ghz)

Wifi issue: 5Ghz (high channel like 157); i have Macbook Pro on same 5GHz channels and no issue.

Both my daughter and I (both iPhone 12) have the same issue the past few days (Nighthawk AC3300 wireless router, Spectrum Fiber).

On iPhone, doing Speedtest (using App) 2.4 Ghz band works fine, 5 GHz band woefully slow.. have checked multiple sites within home, near and far, same results.

Alienware Laptop (Killer WiFi), doing Speedtest (again using Windows App) 5GHz is about three times faster than 2GHz, again at multiple locations near and far, throughout the house.

My iPadPro 12.9" 2019 shows the same results as my laptop, from multiple locations. I am using a new wireless ipad keyboard as a case.

I first suspected it might be our cases (We both have Otterbox Defender cases) but after removing the phone from the case and doing a test, no joy... still significantly slow (talking at least 10 times slower) so it appears to be a hardware issue with the new WiFi AX (Wifi 6) hardware in the new phones.

Will next try another wireless router to see if that helps.

İ am not 100% sure but İ feel like i solved my issue by entering my modem’s interface and changing a wifi term which was fixed into 36/80 to automatic.

hope that it really helped. We’ll see.