WiFi Speeds (iPhone 12 Pro Max)

Wi-Fi and Bluetooth are in the same microchip.

It’s a known issue and Apple is working on it

What brand WiFi router?

I can name at least four with which the 12 Pro Max has zero issues.

Which Cisco and Ubiquiti do you have?

Correct but the main issues with the modem and it’s firmware affects us over wifi 6 and 5G.

My Low end Android phone has stronger wifi connection than my iPhone12ProMax,.

My android play HD Netflix videos

My iP12PMax buffers then shifts to low resolution,.

I’m having the speed issues regardless of which app I use. Speedtest (app) shows slow downloads (I expect closer to 1 gb). When I use fast.com from safari on my phone I get the same slow speeds.

No issues here; sounds like a DNS resolution problem.

I have done what you suggested and connected directly to the 5Ghz network. It did perform much better. Still doesn't explain why the MBP and MBA can use the mixed 2.4/5 ghz network without issue and the iOS devices need to be forced onto a 5Ghz network to perform better. Don't have the same issue with an iphone 7 plus that is not on 14.2

This is definitely not an isolated issue. I have been having this issue since I got my phone earlier this week and I thought it was just me because I was unable to find anything related to it in other forms. I have reset my router, removed and re-added to Wi-Fi network, reset my network settings etc. none of that worked. This is not an issue on any of my other devices including my iPad Pro, iPhone SE (work phone) and my iPhone X which I use for beta testing and both of my kids phones are working the way they’re supposed to so it is specific the 12 Pro Max. I’m hoping this can be corrected with a firmware update because I’m paying for High speed internet with a mesh network and only pulling 20 to 50 Mbps on my device is unacceptable.

I received my IPhone 12 Pro Max last week and I also noticed my WIFI speeds were very inconsistent. I have Xfinity Xfi modem and usually get 350+ Mgbs per second, which I had gotten on my iPhone 8 plus and IPad later model and all laptops. I have tried every troubleshooting thing I have found such as forgetting network and all the other things previously mentioned in these threads. I'm glad to know it's not just my new iPhone 12 Pro Max.

Does anyone have a good resolution?

Out of curiosity I tried replacing my router to see if that resolved the issue. My normal setup is two Nest Wifi routers connected with an ethernet backhaul. I replaced that with a Linksys 5400 and ran a speed test directly in front of the router and got about 500Mbps when I walked over to the next room it dropped down to 27Mbps so it's definitely NOT the router and has everything to do with the phone. I reverted back to my previous setup and still the same thing. Still unable to determine if the issue is hardware or software related. I am able to determine this is extremely frustrating.

I am sorry that in your case none of the solutions i posted worked, in my case one of the suggested ones solved my wifi problem on my iphone 12 pro max. Maybe someone else finds his solution with that link.

I tried this plus every troubleshooting solution with my TP-Link AX6000 router and it did not resolve this issue. Once in a while I’ll get full speed but most times I get only 1/3 of my speed (940/880) FiOS fiber optic connection. Has anyone tried working with Apple to see if we can fix it with a workaround or a future update?

@nasa311 I've reached out to Apple Support and currently is working with a support tech, hopefully something goes of it. Based on the feedback I've seen here it's certainly an issue with mesh networks, and some of the suggested fixes may not take that factor into account. It's overall weird, but I'm still optimistic it can be fixed with a software update.