Problem with 5GHz Wifi on iPhone 12 Pro

My 5hz on iPhone 12 is not working but it is working on iPhone 11 Pro Max

just tested my 12 Pro on the 5Ghz WiFi again. Same issues. It is connecting to the network

FrostbiteXX Said:

"Does anyone have any experience with Google Nest WiFi and iPhone 12/Pro on 5Ghz band?"

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Try the Following:

A. Ask this in the Google Nest Community:

Go here to ask our question: Google Next Community - Google Support. Many would have firsthand interactions on this, being fellow users.

B. Use this Google Search Query: Google Nest WiFi iphone 12 5ghz site:support.google.com

Here are some results:

• Restart the Google Home app on your iPhone to complete the process. Source: Solved - Google mini gives kGSKErrorDomain error - 740010 - Google Nest Community
• Also, see this post, with in-depth replies: I have SiriusXM on iPhone and home computer . Home do I connect to my Google home unit? Google Nest Community

C. Other Google Community Sites:

• Google Home speakers
• iOS device
• Google Assistant on Google Nest devices

Been dealing with this exact problem for weeks. Have a newer XFINITY router. Started with our two new iPhone 12 Pros. No issue with iPad or iPhone X. It also acts weird in settings for WiFi. Sometimes when it hangs, it shows the WiFi icon and only switches to 5G/LTE when going into the WiFi settings. Then sometimes it doesn’t even see our WiFi (all while I can be using it for work with no problems). Apple either has a hardware or software issue with these phones!

I have the same problem with my iPhone 12 pro. Siri and all apple services such as Apple Music, Apple TV+, iCloud photo library and iCloud backup isn't working with the 5Ghz network, but works fine on 2,4Ghz and cellular. Everything else such as web browsing works fine on 5Ghz, and the other apple devices in my house have no problems with the 5Ghz network.

If it helps others, my iPhone 8 just upgraded to 14.2 and now it has trouble discovering the 5GHZ. my 2.4 and 5 have different names so once it connects to the 2.4, then it can see the 5ghz name and will connect to use it. BUT once it sleeps, on opening, will drop back to the 2.4

Thanks Lawrence but I don't think this is an IP conflict issue.

The DHCP server is in my control and I wouldn't even be posting here if that was the case.

The OpenWRT router just throws a fit shortly after the iPhone 12 is connected to the 5ghz network, no issue when it's on the 2.4ghz network.

Devices on other subnets and vlans are effected too and throughput is diminished for ALL devices.

I'm presuming the iPhone 12 is using some new wireless feature that earlier devices weren't and that this is not fully supported by my router.

PoindexterMN wrote:

To the apple support people - it's not the modem, it's not the router, it's not the ISP, it's the iPhone 12 - please take this seriously and attempt to resolve the problem rather than spitting out unhelpful answers from your checklist of typical "solutions for dummies" ;)

There are no Apple support people in this user-to-user forum. There’s a link at the top of this page where you can interact with Apple support people.

That's a problem with your Wi-Fi router or other network access controls.

Private Wi-Fi addresses just spoof a MAC address for a network as if a new device was connecting to it.

That will only slow down access if your network takes different actions if it doesn't recognize a connected device.

The is not a router problem. Use of the Wifi logging entries on an Asus router shows that the RSSI of the new Iphone 12 pro max is less that the Iphone 12 Pro and Iphone 11. Many routers have a security feature to disconnect clients with a low signal strength and this can cause random behavior. Whilst the private address should <not> cause a change in signal strength, it actually does decrease signal strength by 4db on both the iphone 11 and Iphone 12 series according to the router RSSI. This really is a problem with the new Iphones having less wifi signal strength and so as a result turning off the private address ( though it should not) gets you an additional 4db - just enough to rise above the background interference. The other item you have to turn off ( when signal strength is low) is settings-cellular-wifi assist - turn it off soo it does not keep switching between cell data and wifi. There has to be a problem on the wifi modem in the 12 pro max causing lower signal strength. every person on this list should log a support call with apple saying they have a signal strength RSSI problem, and the problem is exacerbated when private address is turned on ( the default). 2.4ghz travels further, and better through walls so thats why using 2.4 ghz appears to solve the problem. the problem with 2.4 is its like a 2 lane highway where 5ghz is like a freeway considering how close you neighbors may be.

very thorough analysis.... I think something is corrupted on the iPhone.. just a guess...

i tested iPhone 12 vs iPhoneXR. side by side to same Netgear home router on 5Ghz channel:

• iPhone 12 was restored from XR.
• no issue on XR, very low throughout in 12
• reset network settings in 12 and still issue
• no issue with 2.4Ghz channel
• Reset network settings on 12 and still issue
• Resolved it by doing this:
• Forget SSID on iPhone 12
• change SSID on router to some other name
• connect from iPhone 12 and throughput issue gone
• Rename SSID back to original name on router
• Reconnect to SSID on iPhone 12 and no issue for a few days now

Update. Setting manual DNS has not completely solved my problem. (Yes yes I know. But it did make a diff so there is a SW fix reqd here). Again I have 2 WiFi issues with this new iPhone 12 Pro Max that I do not have on the older iPhone 8 - that I have here also(both phones on 14.3) Problem#1) 5Ghz is same same lower throughout as 2.4Ghz using the 12, even with line of sight to router. On the 8 the 5Ghz cxn gives 3x throughout. Problem#2. At some point the cxn will just not transfer any more data. Dead in the water. Happens on both 5Ghz and 2.4. Only way is to disconnect and reconnect WiFi (toggle airplane mode) to budge it.

setting the manual DNS fixes the throughput issue on the 12 - I have no idea why. It also increases the duration before I get a “dead in the water” but I’ve had that problem#2 now again after more than 48hours.

hopefully apple is working on a fix as it’s pretty annoying.

Ps: I use Speedtest to check my throughput. I’m happy to share screenshots if required.

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I just got my new iPhone 12 Pro yesterday and I’ve noticed some problems with the 5GHz WiFi at home. For instance, some apps won’t download data, the Apple Music app won’t play music and the Apple Photo app won’t update/download photos over the 5GHz network. Other services work normally, I can also browse the web with Safari over the 5GHz network. Some things work, some don’t. When I switch to the 2,4GHz network, everything works as normal, no problems at all. All my other devices though, for example iPad Pro or iPhone 11 Pro don’t have any issues whatsoever with the 5GHz network. It’s just the 12 Pro.)

we had to turn off nord vpn from Home Screen on our new iPhone 12 to fix this problem. Obviously, we won’t be able to use our iPhone on public WiFi now, unless some one (nord or apple) can fix this

i have always used Google DNS servers with Cloudfare as backup. The difference was that my Ubiquiti router was the intermediary. Things work fine with non iPhone 12 devices but only my 12 is giving me issues.