Data connectivity
You need to configure your devices with the following to ensure you can use data:
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Cellular Data is ON
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Data Roaming is ON
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APN is configured correctly
See below links to help you configure your APN in various types of devices:
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Configure APN in iOS devices
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Configure APN in Android devices
See below links to help you figure out advanced APN configurations:
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APN list per Profile/ICCID-IMSI prefix
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APN configuration methodologies