iPhone 17 Pro Max extremely slow Wi-Fi and unstable.

I turned off the iCloud privare relay and my wifi is way more reliable and faster than before. downside is now everyone can see what I do on the internet.

No solution, as far as I'm aware. I've done a lot of looking around online and essentially it seems that the new wifi radio in the 17 series doesn't work very well with some networks that aren't Wifi 6 or 7. It's no better in iOS 26.1, and I've seen nothing to suggest that the iOS 26.2 betas have fixed it.

Mine starts off fine after a restart, but then slows down after a day or so, until I restart the phone again. I have just restarted it again now to sort it out. Each of these speed test results shows the speed before and then directly after a restart, in the same location (my maximum is 150 Mbps, and I'm one room away from the router).

I haven't bothered contacting Apple Support because even if they replace the phone, I suspect the replacement will behave in exactly the same way.

iOS 26.0.1 was released yesterday. Please update your iPhone and test immediately. If you continue having issues I would return the iPhone for a new device. Apple has a 14 day return policy I’d take advantage of.

I had same issue with 17pro. My wife’s iPhone 15 is connecting at 250 mbs and my new 17 is around 10 mbs. Spent hours on phone to apple specialist. No progress so insisted they changed phone. Still no better. I suspect this maybe a hardware problem. Wish I’d kept my old phone.

Post the data in the blocks from the following shortcut, for each phone:

https://github.com/intuitibits/shortcuts?tab=readme-ov-file

This:

Also, do you have a Mac or PC available to scan the Wi-Fi?

Is this network Wi-Fi 6, Wi-Fi 6E, Wi-Fi 7, or something else?

Is the Wi-Fi router firmware current?

I have similar problem as you have - EU based and iPhone 17 Pro. What I discovered, if my phone is turned back to the router, my WiFi speed is around 1-10Mb/s. But as soon as I turned left or right (left or right side to the router), magically speed is rising to ~900Mb/s. I tried it multiple times always with same result. Apple are U kidding me?

Some routers have settings/features like WiFi boost or WiFi optimizer. Try turning them off, restarting both devices and seeing what happens.

And all of that can be caused by local Wi-Fi issues, and by issues with newer Wi-Fi standards both supportedin the iPhone 17 and in the local Wi-Fi network, and the increasingly prevalent Wi-Fi mesh networking can double (or more) the exposures to interference. The local tools on iPhone and iPad are limited, which is why I asked about I did.

This is my result from that shortcut. Every other device works fine including the MacBook Air that I'm using right now. Router firmware is up to date, previous gen iPhone works without a problem. There's just something about the new 17 series (presumably the new wifi chip they're using) that doesn't like certain wifi setups. Same thing happens at my mum's house, but that's not terribly helpful as she has the same ISP and router.

I have absolutely no desire to reconfigure my entire wifi network and reconnect all the phones, tablets, computers and smart devices, just because this brand new phone simply refuses to work properly.

Your SNR is excellent, and Wi-Fi gear looks to be Wi-Fi 5 or later.

Unless “every other device works fine” is using the same Wi-Fi revision and the same channels and the same chipset, it’s useful for ruling out some cases such as ISP outages, but less useful for predicting whether different clients will also work. Or not work.

Are things working better on different Wi-Fi networks from a different ISP? Because whether this is an Apple issue or a problem with the router or local interference is still unclear.

It’s really difficult to test on other networks because of the nature of the problem - it starts off fine but then the speed drops over a number of hours or days. It’s rare I’d be on another network long enough for the issue to present itself. And of course, for a lot of other networks, I wouldn’t know what the speed is supposed to be.

I stayed at my mum’s for a few days earlier in the month and experienced the very same issue. This info is of limited use because she has the same ISP and router as me, but I’d say that means it’s not local interference.

The reason it appears (to me, with very limited knowledge of these things) is that in addition to not experiencing this slowdown on other devices, a restart of the phone solves it instantly, but only temporarily. I can be getting 15Mb/s, and no matter what I do at that point (disconnecting, switching off the wifi etc), the speed will never improve. But when I restart the phone, sitting in the exact same place, I immediately get over 100Mb/s again.

I’ve tried forgetting the wifi network, and I’ve even reset the network settings on the phone. But nothing has helped.

Have you restarted your router and modem since updating your new iPhone?

Here’s my 17 PM on Spectrum/Charter WiFi with their equipment.

I’m having the same issue. We don’t have the fastest broadband - it’s 150Mbps, and all other devices are working fine, as did my 13 Pro.

My 17 Pro keeps dropping to speeds like 20Mbps. When I restart the phone, it works normally and I get speeds over 100Mbps, but by the end of the day it’s dropped right down again.

This hasn’t been resolved in 26.0.1 and I think I’m going to need to contact Apple about it.

Wife and I just switched over to iPhone 17 Pro recently. Since then we have been experiencing loss of connection while using wireless CarPlay on multiple occasions while driving. It wasn’t an issue with our 15 Pro until the switch (for well over 2 years).

At home the WiFi connection was poor too. Often getting stuck with one AP in our MESH network as we roam around the house. Likewise never an issue with our previous iPhones.

We have 3 older iPhones (1x 13 Pro & 2x 15 Pro) which are still being used. The stark difference in WiFi experience is as glaring as day and night.

Disappointed with the new phone. Failed to deliver even the most basic expectation, merely blowing hot air since its launch.

Yeah, I’m really disappointed. All of my other devices work fine except for the brand new phone. If I restart it, I’ll get full wifi speed, but by the end of the day it’ll have dropped to about 15Mb/s, and only a restart will fix it. I’ve already restarted this phone more times than I did with my old phone during the entire ownership period.

I would like to think it’ll be fixed in 26.1 but I’m not hopeful at all.