About Connectivity Assist
Use cellular data in addition to Wi-Fi for a more reliable internet connection.
Connectivity Assist uses cellular data to improve your connection when Wi-Fi is slow or unusable — in places like your backyard or driveway, or at coffee shops, airports, sports venues, and everywhere in between.
Connectivity Assist appears in Wi-Fi settings — this replaces and supersedes Wi-Fi Assist, previously found in Cellular settings. If Wi-Fi Assist was on when you updated your software, Connectivity Assist is on by default. If Wi-Fi Assist was off, you can turn Connectivity Assist on manually.
Turn Connectivity Assist on or off
In Settings, tap Wi-Fi, then make sure Wi-Fi is turned on.
Scroll down and turn Connectivity Assist on or off. If you want to always stay on Wi-Fi for a specific router configuration (for example, your ad blocker), you can turn off Connectivity Assist for that particular network.
With Connectivity Assist turned on, you might use more cellular data. If you want, you can check or reset your cellular data usage.
Connectivity Assist isn't used when your iPhone is international roaming, in cellular Low Data Mode, or with some third-party apps that stream audio and video.