Unlikely to be Software related (Software appears to be same), could be Firmware related to a Specific Network Operator, difficult to tell from that info.
Assuming its all set up correctly and its allowing you to set up the APN separately but still not giving Service or Internet Connect could still be a number of things, Network Firmware, Regional or Global Firmware imbedded Settings, Partial Networking Retraction, too many to list.
Where did you source the Router from?, which Country or Region, is the Router Sim Network free, how is the Router Branded (on the Box or Case), has this Router ever worked in the UK, if so with which Network?
Does the Sim your using work in another Device in the same location, if yes, how well does it work in another Devices in terms of Network Signal and Speed Quality
Without giving Personal Details, where abouts are you located.
