CDS Information –> Radio Information –> Phone1
On top you'll see "AT+" complete it so it looks like: AT+EGMR=1,7,"imei1" (imei1 being the actual imei),
Click on SEND AT COMMAND
Do the same procedure with CDS Information –> Radio Information –> Phone2 but the command like must be: AT+EGMR=1,10,"imei2"
Reboot the phone and hopefully you'll have two new imeis :-)