Many field-based applications do not have access to a wired Internet connection, instead requiring cellular connectivity. Using a 4G cellular connection provides the advantages of innovation and cutting edge technology and can sometimes be the only cellular connectivity in a remote area. For remote access requirements, a simple SIM card with data plan is all that is needed to connect. Similarly for SCADA-like applications, secure remote VPN connectivity can also benefit from this simple SIM card without the burden of provisioning a fixed IP address on the remote site. Finally, the Flexy 4G extension card ensures an automatic fallback to lower cellular connectivity if the 4G network becomes unstable or unavailable.