We published two weeks ago a tip to warn about Wi-Fi Assist in iOS 9 eating into your mobile data plan. Apple has released a support document describing how the feature works.
With Wi-Fi Assist, you can stay connected to the Internet even if you have a poor Wi-Fi connection. For example, if you’re using Safari with a poor Wi-Fi connection and a webpage doesn’t load, Wi-Fi Assist will activate and automatically switch to cellular so that the webpage continues to load. You can use Wi-Fi Assist with most apps like Safari, Apple Music, Mail, Maps, and more.
According to Apple, most users should use only a small percentage more cellular data than previous usage with Wi-Fi Assist. In addition, Apple reveals that:
- Wi-Fi Assist will not automatically switch to cellular if you’re data roaming.
- Wi-Fi Assist only works when you have apps running in the foreground and doesn’t activate with background downloading of content.
- Wi-Fi Assist doesn’t activate with some third-party apps that stream audio or video, or download attachments, like an email app, as they might use large amounts of data.
Wi-Fi Assist is on by default. To disable Wi-Fi Assist, go to Settings > Cellular, and then scroll down to turn off the “Wi-Fi Assist” switch.
Read more About Wi-Fi Assist.