Here's how to check your cellular data usage on an iPhone, and find specific readings for and manage each app's data.
Only the Apple Watch Series 3 and 4 (GPS + Cellular) models can use cellular data, provided they have been set up with a supported carrier.
I have an AT&T iPhone 4 with the 200 MB/month data plan. Last month, I somehow managed to exceed my monthly cap by 7 MB, even though the myAT&T app showed that I had used 180 MB with 5 days left in my ...
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