Problem with 5GHz Wifi on iPhone 12 Pro

I don’t know what resolved the same issue that I had with my iPhone 12.

• iPhone 12 new in December 2020
• have 2x 5Ghz wifi bands on home router
• slow speed only on 1x 5Ghz wifi band when issue happens. No issue in 2nd 5Ghz wifi band.
• reloading router, still the same
• change Wi-Fi SSID name temporarily to some other name and back fixes issue temporarily for a few days before slow speed happens again
• around end of December, went to Apple store and iPhone 12 replaced. Since then no issue
• i have iPhone XR before and never had this slow down issue on 5 Ghz band.

dieter165 wrote:

Thanks. I simply show the message "cannot connect to ...." although it shows the Wifi name....

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

Apple Support Call helped!

solution was:

make sure backup is in icloud,

connect phone to mac,

short press side button „more volume “, short press „less volume“,

press button on the right hand side off phone and hold until message on mac appears

follow instruction on mac,

and after that...

restore backup.

dieter165 wrote:

What helped in my case at the end? Finally assigning one single ssid name to both , the 2,4 and the 5ghz radio helped. Guess the iphone is confused by two differnt ssid names.

Mine isn’t confused by two different SSID names.

What helped in my case at the end? Finally assigning one single ssid name to both , the 2,4 and the 5ghz radio helped. Guess the iphone is confused by two differnt ssid names.

Hi,

I have more or less the same problem. New iPhone 12 on iOS 14.1 (standard). It is just stuck on upload of pictures from Photos app.

Same as you; change to 2.4Ghz band, everything works fine.

This is with my internet providers build in accesspoint in the router/sentral.

Did a test with my older Airport Extreme in bridge mode. There everything works fine in both 2.4- and 5Ghz band.

Testet also on an Cisco Meraki AP at work.. also doing great there.

My best guess.. some hardware will not work properly together. This is also the first device from Apple with Wifi 6 (802.11ax)?

So my solution for now.. get new wifi hardware, use 2.4Ghz or hope there will be an fix from Apple.

sjtjohnson2004 wrote:

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

That is actually not true. All apps that access data are required to use TLS (Transport Level Security:“SSL”), and as long as you only access websites that use SSL (they will have a lock next to the URL) and you have your email accounts set to use TLS (the default) then all communications between your phone and the outside world will have strong end-to-end encryption, so the fact that the network connection is not encrypted is not a risk.

VPN actually offers no benefit on an iPhone, and using it may be risky. See this commentary: Don't use VPN services. · GitHub

The original purpose of VPN, to access an internal corporate network when out of the office, is the only valid reason to use VPN.

I'm not familiar with the Huawei - I've seen no issue on routers from Apple, Cisco or Ubiquiti.

The first thing you may want to check is whether there are any firmware updates available for your router.

I talked to Altibox support again yesterday. They admit the problem with the FMG, but they would not provide me with the newer VMG for free.

Apparently nothing their techs could fix so they have reported the issue to the producer (in december I think). No solution yet, and they could not give me a time estimate.

Suggest all Altibox customers report this issue to Altibox support and nag them weekly or so for a solution.

Dogcow-Moof wrote:

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.

It would make a difference if the router had MAC filtering enabled and had whitelisted his device’s Wi-Fi address.

Hi there. I was having the same issues and was puzzled why. Setting a manual DNS sped things up for me for now. Wondering if you found a solution to this? I am also on iPhone 12 with a Ubiquiti WiFi setup

Check for a firmware update for your Wi-Fi router.

Went at Apple Store and got iPhone 12 replaced. So far ok

Apple has addressed some Wi-Fi issues in iOS 14.2 and 14.3. As far as we can tell from recent posts the remaining problems are router problems with out of date firmware, not iPhone 12 problems.

Altibox is hoplessly outdated! I can confirm that iOS 14.5 also have the same problem with altibox FMG router. Only solution is to buy new proper hardware.