WiFi Speeds (iPhone 12 Pro Max)

12 pro is slow too. I bought it and returned it after trying everything and wasting over an hour on the phone with apple support. The speed in my home is 400mbs and i get the speed with iphone xr and iphone 11 but the 12 pro was getting around 70mbs so i returned since the newest update didn’t fix the issue.

The problem does seem to me to centre around the WiFi system on the Pro Max, I did find a AX 5G band modem where my 12 Pro Max was the same consistent download speed as other older IOS devices, but only one WiFi modem so far.

My down load speed (upload is the same) n 2013 modem on the 5G band is about 20% slower, my modem has a local WiFi speed test to the modem (once the App was updated to work with OIS14) which shows 350Mbits download where the internet speed max out at 50Mbit on my ISP plan which is where the differences in download speed show up -20%.

Maybe Apple are having trouble with the new modem Qualcomm chip-set and the various modem WiFi standards?

There has been a ton of feedback on this post since it started and it all seems (in my opinion) to point to a definite issue with the WiFi radio/modem which hopefully will be addressed with a firmware fix. The speed issue is going to vary from user to user and real world vs advertised speeds is always going to have some sort of variance, but I think all are in agreeance that there is an issue. I have noticed that I am not having as much of an issue with my device (iPhone 12 Pro Max) not connecting to the correct WiFi band (5 Ghz v 2.4 Ghz) so there is a positive. Here's to hoping for a full resolution soon.

The iPhone 12 is basically a bug-filled phone, green screens, Wi-Fi and 5G slow, MagSafe interference with medical devices...

Apple has came out with many great new products this year, but they've not done a good job with quality and also quantity (they constantly run low on supply and need like 5-6 weeks for any new product to ship).

The 12 Pro Max is the fastest device on WiFi other than a laptop I've ever owned.

If you feel something is wrong, you can make Apple aware of your concerns here:

• Contact - Official Apple Support
• Feedback - iPhone - Apple

Randomly throughout the day, the wifi speed will either be reduced dramatically OR not work at all (wifi signal strong but zero internet working in browser or apps).

As stated previously, I use wifi at home and work, both networks have experienced issues with my iPhone 12 Pro Max. I now have tested 2 iPhone 12 Pro Max's on these networks and same issues occurs with dramatically reducing speed and/or no internet at all. I could try pairing this new replacement to my neighbours network, which my previous replaced phone would also experience issues....however issue has been confirmed on 2 networks, don't think a 3rd network test is required.

Both these networks(home+work) have numerous apple/pc/android devices working flawlessly at max speeds of above +100Mpbs (on each device).

Yes, I can get +100Mbps at times, and then randomly speed will drop to less than 5-20Mpbs (both at home and work). Once that occurs and no other devices are affected, it's just a matter of time when the wifi stops working entirely.

It's guaranteed, every morning I need to turn off wifi on the phone to use the internet because it will not be working on my phone. This issue always occurred on my initial iPhone 12 Pro Max(warranty replaced for this issue) and now confirmed on this new replacement iPhone 12 Pro Max.

I've turned off wifi assist again (was done on previous phone), I'll report back if this corrects the issue on this new replacement.

Well you may be right about radio speed defect falling back I do notice it faster if on router e. Half the 700mbs attached is 350mbs when on top of it. But that’s the point, iPhone 10 didn’t have this issue and our iPhone 11s work all over the house at faster speeds. Dell laptop too. His is 12 pro max defect that affects lots of people

There's not a defect, the 12 Pro Max is the fastest iOS device I've used.

You are not going to see 700 Mbps out of a WiFi signal unless you have a WiFi 6 router and conditions are perfect, and even then it depends on the wireless access point and router. For example, the Apple Time Capsule 802.11ac devices won't pass traffic at much over 650 Mbps even when all connections are wired because the processor can't pass traffic faster.

The speed you posted would be normal for an iOS device connected via 5 GHz 802.11ac signal six feet or more from your wireless access point.

You can often get faster speeds from a computer because of their higher processing power and better antenna placement.

My old iPad get higher download speed than my iPhone 12 Pro Max. I use the same test app on both (UniFi’s WiFiMan), same distance, same signal strength, same channel, same protocol (802.11ac) and same test server. Tried to reset Network settings on iPhone, but still same behavior. It’s not slow, around 180 Mbps, but the iPad is getting 380 Mbps.

My routers are always up to date. I also got 4 other iDevices and 2 computers with good enough upload speed. Anyway, even if it is annoying, I can live with everything above 41.26 Mbps.

I would never ever accept the upload speed you got though, probably a router bug. Have you checked your router for firmware updates?

No, that's standard for DOCSIS 3.1 Gigabit cable Internet; it's officially 1250 Mbps down, 40 Mbps up, but I don't have a router that can handle 2.5 GbE, so its limited on the wire to about 950 Mbps down, and a bit over 40 Mbps up as Comcast over-provisions slightly. For users with 2.5 GbE routers, they usually see around 1400 Mbps down, 42 Mbps up on this service tier.

With 802.11ac on phones, that translates to the mid-500s Mbps down.

Ubiquiti UAP AC HD or Apple Time Capsule (802.11ac)

Also not seen on various flavors of Cisco gear used by various companies.

Have you confirmed via a computer if you have one that you see greater than 200 Mbps down connected to the same Ethernet switch as your NanoHD and that your router isn't the source of the slowdown?

It depends upon how the router negotiated its connection to the device in question, there are far too many variables here from IP addresses assigned to routing issues. It’s not uncommon for a router to have issues passing traffic to one particular IP address and if you happen to get it, this can occur.

Since you experienced it on one of two iPhone 12s, did you contact Apple Support to find out if there might be a hardware issue with the one phone?

Contact - Official Apple Support

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Combination of iOS 14 and Qualcomm modem firmware.