You've probably already heard the new feature iOS 9 – “Wi-Fi Assist”, which provides a more reliable internet connection when the Wi-Fi signal gets weak. We would like to introduce you to four features of this function that you probably did not know about.
1. “Wi-Fi Help” does not work on all devices
Just because you can run iOS 9 on your device doesn’t mean you can use Wi-Fi Help.
iPhone 4s, iPad 2 Wi-Fi + Cellular, iPad (3rd generation) Wi-Fi + Cellular and iPad Mini (1st generation ) Wi-Fi + Cellular does not support Wi-Fi Assist.
2. “Wi-Fi Help” does not work in the background
Wi-Fi Assist is only active in the applications you are currently using and is not active for background content downloads. So if you are browsing Facebook “Wi-Fi Help” will work. But if you update apps via App Store in the background, this feature doesn't work. This way, you don't have to worry about Wi-Fi Assist if you have background updates enabled (Settings> General> iTunes Store and App Store) or automatic downloads (General> iTunes Store and App Store) using cellular data.
3. “Wi-Fi Help” does not support all-round applications
To limit unexpected charges for mobile Internet, the company Apple has restricted the use of the Wi-Fi Assist feature to some third-party applications that transfer large amounts of data. These are video streaming and music service applications, as well as applications that can download large attachments such as email clients or file downloaders.
4. “Wi-Fi Assist” does not work when roaming
For the same reason as above, Wi-Fi Assist is not available while you are roaming, so you do not have to worry about its activity while you are abroad.
Despite all these limitations, Wi-Fi Assist can still use a lot of data. Fortunately, this feature can be easily turned off.
For more information on the Wi-Fi Help feature, check out the new support page on the website Apple.