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docs-develop/gateway-configuration/cellular-configuration/index.html

@@ -4396,7 +4396,13 @@ <h2 id="cellular-configuration_1">Cellular Configuration</h2>
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-<p><strong>APN</strong>: defines the modem access point name (HSPA modems only).</p>
+<p><strong>APN</strong>: defines the modem access point name (HSPA modems only).
+    This is an optional parameter. If left empty, the value is automatically picked up from the 
+    Mobile Broadband Provider the modem is registered to. If a value is filled, the APN value is explicitly 
+    configured and the default value is overridden.</p>
+<p>A good practice is to set the interface status to <strong>Disabled</strong> and then <strong>Enable For WAN</strong> when the APN is 
+explicitly set. NetworkManager, indeed, will fallback to the default value if a wrong APN is specified, causing 
+misleading behaviors. This does not happen if the interface is disabled and re-enabled after APN changes.</p>
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 <p><strong>Auth Type</strong>: specifies the authentication type (HSPA modems only).</p>