What is an APN, and how do I configure this setting?
An APN is the name of a gateway between a 3G network of your carrier’s cellular network and another computer network: the public internet. APN stands for Access Point Name. When we want the UNI-GRx to make a data connection, the APN must be configured with the correct settings so that the carrier can read these in order to generate an IP address for the UNI-GRx. All the complex things are done on the carrier side, but we only need to make sure the settings are correct.
You can check this article on how to set.
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