Are you referring to "Connecting to the SRX300 Services Gateway CLI Using a Dial-Up Modem"? if so please refer to below URL.
If you are referring to 4G/3G Connectivity using USB, its not supported.
Are you referring to "Connecting to the SRX300 Services Gateway CLI Using a Dial-Up Modem"? if so please refer to below URL.
If you are referring to 4G/3G Connectivity using USB, its not supported.