How to avoid a surprising bill due to Wi-Fi Assist

Apple's iOS 9 extra for ensuring consistent Internet access comes switched on. We recommend turning it off in most cases.

Note: When you purchase something after clicking links in our articles, we may earn a small commission. Read our affiliate link policy for more details.

Glenn Fleishman’s most recent books include Take Control of iOS & iPadOS Privacy and Security, Second Edition (covering iOS 15/iPadOS 15), Take Control of Your M-Series Mac, and Take Control of Securing Your Mac. In his spare time, he makes Tiny Type Museums. He’s a senior contributor to Macworld, where he writes Mac 911.