This is just small reminder to change your SSH login and password. With all of the jb iPhones these days it's pretty easy to just grab a laptop, scan for some iPhones and ssh to them without the person knowing. They can steal the info on your iPhone. Regardless if ou keep ssh on or off it's just a smart thing to do just in case. If you frequent crowded places than definitely change it. Even if there's a low chance of this happening it's better to spend 2 minutes to do it then not.