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Question: Slow Wifi on iPhone X

I recently purchased an iPhone X. All is well except for the wifi speed. Its slow on the iPhone. I have 40 mb connection but the speed test shows around 15 Mb normally. Apps are also slow to load such as Instagram. Net is working fine on other devices such as my old iPhone 6s, iPhone SE, iPads and macbooks. Its something with iPhone X.

I have tried forget the network and join again, reset network settings, hard restart iPhone but no luck. Anybody else facing the same issue? Any solution for this?

iPhone X, iOS 11.2

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Question marked as Apple recommended

Dec 13, 2017 1:42 PM in response to kashif789us In response to kashif789us

There may be an issue with the firmware on your router and its compatibility with the phone or the phone's software.


Try it on a different network and see if you get the same results.


If your router is dual band, test the results on the other band.

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Question marked as Apple recommended

Dec 13, 2017 1:42 PM in response to kashif789us In response to kashif789us

There may be an issue with the firmware on your router and its compatibility with the phone or the phone's software.


Try it on a different network and see if you get the same results.


If your router is dual band, test the results on the other band.

Dec 13, 2017 1:42 PM

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Dec 19, 2017 2:52 PM in response to madra31 In response to madra31

I'm using Apple Airport Extreme using it as a router connected to a Charter modem with 100Mbps. I get those speeds with my other devices over wifi, except my Iphone X. It's only clocking between 10-25 Mbps. Did the network reset as well. I believe it's the phone itself.

Dec 19, 2017 2:52 PM

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Dec 29, 2017 12:52 PM in response to Moe2018 In response to Moe2018

I went into airport settings and gave the 5GHz a name so I could selectively choose it when I rejoined my wifi. I also reset the network setting on my phone before joining. I'm getting 100mbps speeds now. The Airport should've done this automatically? Anyway, give that a try and see how it works out.

Dec 29, 2017 12:52 PM

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Jan 4, 2018 5:34 PM in response to joeyfromnorthport In response to joeyfromnorthport

Tried this.


It's not working at all.


Macbook Pro and iPad Mini are all getting 110mbps, but the iPhone X is getting 15mbps to 25mbps. Sometimes it loses the 5GHz network altogether. This is really frustrating. I'm about 19 steps away from my router in a single family home (no second story).


Originally thought it was the router, and Apple replaced my Airport Extreme. Came home with a new setup, and the issue remains. I reset network settings as well.

Jan 4, 2018 5:34 PM

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Jan 11, 2018 9:44 AM in response to MacAdam In response to MacAdam

Seeing same issue, just posted about it in another forum:


I am seeing serious issues on iOS 11 (latest version) with WiFi download speeds. I also saw this on previous iOS 11 versions. I have gigabit Fios, has been tested numerous times on the wired connection with multiple devices and is running at the correct speed. iPads in the house pull about 500 down and 500 up....which is fine given all the potential issues WiFi can have. My iPhone X however can upload in the 500 range but over and over pulls 100 or less down. This has been tested with a Fios Actiontec router, a latest version AirPort Extreme, and a

Synology 2600....all with up to date firmware. All were placed in the same spot, set up independently, all with a dedicated connection from the ONT. I am confident it is the iPhone that is the problem, I will be testing tonight with another iPad and with an iPhone 8 (all on iOS 11) and will report what they show as well.
Edit 1: my iPhone X test were run before and after resetting all network settings on iPhone

Jan 11, 2018 9:44 AM

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Jan 12, 2018 8:29 AM in response to Moe2018 In response to Moe2018

I think I got it, annoyed I didn’t think of this sooner. My speed test app automatically picks the server to bounce the test off of, but my computer doesn’t. All I needed to do was manually change the servers I tested against and after trying a few it turns out most of them are in the 500/500 range, whereas the one the the Speedtest automatically picked was still only 100 or less down. So it would appear that the issue wasn’t my phone or iOS but rather the speed test app itself and the manner in which it chooses servers.

Jan 12, 2018 8:29 AM

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Question: Slow Wifi on iPhone X