ios 11 slow wifi speeds

Updated my 6s and now my WiFi speeds are at a crawl mostly under 25mbs in the same room as a laptop getting 75mbs download speeds.


I’ve done a Forced Restart

Toggled WiFi on/off

Forgotten WiFi networks

Reset WiFi networks

Turned off Location Services


Etc etc etc


The only thing I have done is reset the entire phone 📱


Anyone else reporting these issues?

Posted on Sep 20, 2017 11:19 AM

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Posted on Nov 22, 2017 5:14 AM

Try connecting to WiFi on the 5 GHz band instead of 2.4 GHz if your router has the option. This worked for me.


I had this same problem since I upgraded to iOS 11 on my iPhone 6S Plus. I tried everything suggested except for a full restore.


I was connected to my router via the 2.4 GHz band when having the problem. I would get >50 Mbps on my Macbook but <1 Mbps on my iPhone when running a speed test.


I instead connected my iPhone to my router's 5 GHz band and have consistently been getting >50 Mbps on my iPhone now and have had no problem with WiFi on iOS 11 since switching bands.


I hope this helps all of you.

132 replies

Nov 6, 2017 5:30 PM in response to r_dizzle

I totally agree, whatever helps only helps for a while. The issue comes back.


So let’s discuss this....


Is there a WiFi cache? I have issues on mail PLUS safari. Plus in some apps (I am talking to you CNN and The Weather Channel) that take FOR-EVER to load. Could some cache be full?


Could it be the WiFi session doesn’t close and thus it keeps thinking it has an open session?


Could it be carrier related? Bad SIM card?


Obviously I am an end user who is just supposing.


And WHY would my wife’s phone and iPad have no issues?

Nov 20, 2017 10:39 AM in response to fidola13

I'm experiencing similar issues.

I have fios Gig speed and my mb pro is getting speeds around 400MB down/800MB up via the 5G ac network. My iPhone X on the other hand is getting speeds around 50MB down/400 MB up via the same network. I've been back and forth with verizon but they insist the home is receiving full Gig service speed and it must be a hardware issue on my end (right).


Also, I had 150MB/150MB speeds at my previous home and would consistently get that or higher using either device.


Also tried fidgeting with all the setting on the phone and restarting/hard restarting, etc. to no avail.


Not making any sense/adding up to me...

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ios 11 slow wifi speeds

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