Why is my new iPhone 13 using my data allowance so quickly?
Why is my new iPhone 13 using all my data allowance so quickly?
iPhone 13
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Go to Settings > Cellular, then turn Cellular Data on or off for any app (such as Maps) or service (such as Wi-Fi Assist) that can use cellular data. If a setting is off, iPhone uses only Wi-Fi for that service. Note: Wi-Fi Assist is on by default.
View or change cellular data settings on iPhone - Apple Support