The Ewon Flexy using the 4G card FLB320A could not connect to the Internet when an EE SIM card is used.
To get the 4G connection working using an EE SIM card, you must set the following COM parameters.
Go to Setup > System > Storage and Edit COM.
Edit the value of PDPContext and type "1"
Edit the value of PDPType and type "IP"
Save and reboot the Ewon.