Data can cost you big bucks if you're not paying attention. This article explains how to check data usage directly from an iPhone or Android phone or through a major carrier, such as AT&T, Verizon ...

Tap Mobile data usage or Wi-Fi data usage, depending on what you want to check. The top of the screen displays your data usage for the current month (as determined by your billing cycle).

Update 6/25/24: Bugs are normal for betas, but we’ve noticed the System Data issue remains with the second iOS 18 beta. My iPhone System Data use jumped up from 8 to 35 GB while one of my ...