No, they can't see that. They will only see your IP address. You can use the same data sim providing that you change your IP address every time you log into another account.
Are you connecting via PC or via Phone/Tablet?
You should manage accouns on different pc users in order to keep cookies separate one account from another.
Well my setup is:
Virtual Box
several virtual machine
each virtual machine use the same dongle and same data sim
dongle will give you new IP every time you connect, BUT DNS still the same ( is that a problem same DNS? )
I agree, the dongle give a new IP every time you log in, or is there anything else I can do?
I wonder if i can set the IP manually for the dongle? can I?