Does modem select network manually or automatically?

Modems have network selection set to automatic by default (AT+COPS=0). The modem control script does not need to issue the AT+COPS command to avail of automatic network selection.
A modem with manual network selection will perform GSM registration only if the specified
network is available.
Make sure your application gives the modem enough time to register. If you use a timer to
determine GSM registration success, make sure that you allow at least five minutes.

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