Assuming all of the defaults you literally need to set the APN up using the at+cgdcont command and then leave it. The defaults have NB1 set as the first bearer it searches and this can take quite a while to complete.
Alternatively just use the at!selrat command to set M1 as the only bearer you want to use as per the below.
at!entercnd="A710"
at!selrat=12 //This sets it to M1 and 2G
at!reset //Reset the unit for the settings to take effect
So SSH used to be turned on but for obvious security reasons we have turned it off by default, you can turn it on if you want to be able to SSH into it.
Assuming you do turn it on then you would connect to the AT port using the below command microcom /dev/ttyAT