Information about this setting is hard to come by, but it appears to relate to devices and carriers that are capable of switching between CDMA technologies (including EvDO) and LTE.

This should be set to the setting that is supplied by your carrier or listed under the recommended APN settings on their website. If it is set incorrectly, data may not work at all.


More in What the APN settings mean

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A user-chosen name to apply to this APN configuration. Has no effect on the connection.