Inserting a SIM card into a Credit Card Terminal (Portable) is a straightforward process. Here are the steps you can follow:
Remove back cover and battery of Credit Card Terminal (Portable).
Align SIM card to the SIM card tray slot (SIM 2)
Gently slide the sim card into the sim card slot, SIM card facing downwards.
No further configuration is required, 4G will be enabled automatically.