Is there a way to find the EMEI number of a Cellular Bridge?
Yes. Put the Bridge into Configuration Mode and open the Configuration Tool (10.0.0.10). In The Network Setup tab, the "Connection type" should be "Cellular".
Now go to the Diagnostics tab, choose at the bottom "Cellular" radio button, enter "AT+CGSN" and press enter and the IMEI number will appear in the Diagnostics screen.