I have the new Kite device on 4GEE, TBB tests show speeds of about 20/11 to 30/17. No changes to the setup, I've swapped between the two connections and each time it works fine with Virgin.
Do I need to do something else to enable the phone via Mobile BB ? I've looked on the Sipgate help but cannot find anything that has helped. I did find that their basic setup told me to enable ports 5060-5060 and I had to change that to 5060-5061 for it to work on Virgin.
Virgin Cable (50/3) + EE Mobile BB