Settings (iPhone)
The example is for iPhone 15 Plus (iOS 17.1.2).
After traveling overseas
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STEP 01
Tap "Settings"
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STEP 02
Tap "Cellular"
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STEP 03
Tap "Cellular Data Options"
- If "Cellular Data" is "Off", turn it "On"
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STEP 04
Enable "Data Roaming" ()
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STEP 05
In STEP 04, tap "Voice & Data" and make sure "5G Auto" or "5G On" is checked.