For enhanced function of the AER1600 Series Micro-Branch Router, you will need at least one activated 2FF-sized SIM card with active cellular data plan. SIMs with wireless broadband data plans are available from wireless carriers such as AT&T, Verizon, and T-Mobile. The SIM must be provisioned by the carrier. Contact your carrier for detail about selecting a data plan and about the process for provisioning your SIM.