You can install a SIM card of any operator supporting 2G internet into Hub 2 (2G).
Prior to installing the SIM card into the hub, disable the PIN code request in the settings menu (in order to do this, you need to insert the card into a phone). Furthermore, your mobile account must have a positive balance or bonus megabytes of traffic.
We recommend inserting two SIM cards into Hub 2 (2G) at the same time as one SIM card may stop functioning if you run out of balance or if a failure occurs on the provider’s side.