APN name should match the carrier exactly, including capitals, dots and spaces; if required, also check any username and password. Make sure the APN you configure matches the service type (public, private or corporate) and that automatic APN detection isn’t pulling a consumer setting. Also verify the SIM is provisioned for data and that the carrier supports the required bands or service type. If possible, test the SIM in a known-good device to confirm service before changing router settings.
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What APN details should I verify if the router won't connect?
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