Navigate to Settings > Cellular (or Mobile Data) and toggle "Cellular Data" to the ON position. When you first power on an iPhone, the device will attempt to locate a compatible network.
Configuring APN Settings on iPhone for Cellular Setup
Insert the SIM card or eSIM profile provided by your mobile operator. However, if you are experiencing connection issues or switching carriers, you may need to check the Access Point Names (APN).
Troubleshooting Common Connectivity Issues Even with the correct settings, connectivity can falter due to software glitches or environmental factors. If you see "No Service" or an exclamation mark over your signal bars, try the following steps.
How to Configure APN Settings on iPhone for Cellular Setup
Setting Description Cellular Data Master switch for internet connectivity via the cellular network. If this process stalls, you might need to manually initiate carrier activation.
More About Setting up cellular on iphone
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