What changed: rewritten for iOS 27 with our own screenshots. Wi-Fi Assist is now Connectivity Assist, under Wi-Fi.

howtosimply.com/guides/how-to-turn-off-connectivity-assist-wi-fi-assist-on-an-iphone/ · Checked October 2026 · iPhone 14 Pro · iOS 26.7.1

In this guide

Open Settings and tap Wi-Fi
Scroll to the bottom
Read what it does
Switch it off
Check the data it used
If you do not see this option
If this does not work
Sources

Quick answer

On iOS 27, open Settings, tap Wi-Fi, scroll to the bottom and switch off Connectivity Assist. It replaced Wi-Fi Assist, which used to be under Mobile Data. While it is on, the iPhone uses mobile data when the Wi-Fi is slow, which can cost data.

5 of 5 steps with real screenshots · 2 official sources below

Device: iPhone
Shown on: iOS 26.7.1 (iPhone 14 Pro), iOS 27.0.1 (iPhone 14 Pro)
App: Settings
Path: Settings › Wi-Fi
Real screenshots: 5 of 5 steps
Checked: October 2026
Sources: 2 official, linked below

Step by step

Open Settings and tap Wi-Fi
Wi-Fi is near the top of the main Settings list, under Airplane Mode. On our iPhone it read Off at this point.
Done
Scroll to the bottom
Make sure the Wi-Fi switch at the top is on. Below Known Networks and Other Networks is Connectivity Assist.
Done
Read what it does
The note below says it uses mobile data in addition to Wi-Fi for a more reliable internet connection, and that the iPhone keeps track of how much mobile data it used.
Done
Switch it off
Tap the Connectivity Assist switch to turn it off. It is green while it is on, as in our picture, which was taken before the tap. The iPhone then stops using mobile data in addition to Wi-Fi.
Done
Check the data it used
Your total mobile data is under Settings, Mobile Service, boxed in the picture. Reset Data Usage, under the Connectivity Assist switch on the Wi-Fi page (step 2 picture), sets its own counter back to zero.
Done

What changed: rewritten for iOS 27 with our own screenshots. Wi-Fi Assist is now Connectivity Assist, under Wi-Fi.

If you do not see this option

Your iPhone runs iOS 26 or earlier. The switch is still called Wi-Fi Assist. It is at the bottom of Settings, Mobile Data (Cellular in US English).
There is no Connectivity Assist row. Apple says to make sure Wi-Fi is on in Settings, Wi-Fi, then scroll down to find it. Source: About Connectivity Assist
The phone has iOS 26 or earlier. Apple says Connectivity Assist replaces Wi-Fi Assist, which was in the mobile data (Cellular) settings. Source: About Connectivity Assist
It was already off after updating. Apple says Connectivity Assist is on after the update only if Wi-Fi Assist was on before. If Wi-Fi Assist was off, it stays off. Source: About Connectivity Assist

If this does not work

Mobile data is still used on one network but not another. Apple says Connectivity Assist can be turned off for a specific network, for example one with an ad-blocking router. Check that network's settings in Wi-Fi. Source: About Connectivity Assist
It seems to do nothing. Apple says it isn't used while roaming abroad, when mobile data Low Data Mode is on, or with some third-party apps that stream audio and video. Source: About Connectivity Assist

About this guide

If your mobile data runs out faster than expected while you are mostly on Wi-Fi, Connectivity Assist is a likely reason. iOS 27 renamed Wi-Fi Assist and moved it from the mobile data settings to the bottom of the Wi-Fi page, so many people cannot find it.

The screenshots are our own, taken on an iPhone 14 Pro running iOS 27.0.1. They were recorded over USB in QuickTime. It was switched on on our phone. The network names are blurred.

In short: iOS 27: Settings, Wi-Fi, scroll down, Connectivity Assist off. iOS 26: Mobile Data, Wi-Fi Assist.

Sources

Links checked in October 2026. Menus and features can change after software updates. These steps match the version named at the top.