Here's how to check your cellular data usage on an iPhone, and find specific readings for and manage each app's data.

Most mobile carriers have a phone line for data usage checks. You can also see how much data is left in your online account or the company's app Data can cost you big bucks if you're not paying ...

Sign in to the router using its admin credentials and look for a section about statistics. A third-party app usually offers more detailed stats for routers that don't track data usage. This article ...

FaceTime calls do use data, and you can check how much through the Settings app on your iPhone or iPad.

As seamless as Apple makes it look, FaceTime isn't magic. Like every other video-conferencing app, it works by streaming video and audio between devices, which means the moment you're off Wi-Fi, it's ...