TBH this is something you should have checked before ordering.
I think you should be able to use OpenDNS with a dynamic IP.
You just need to use a DDNS client which can be run on some routers (I think even BT homehubs) otherwise on a PC.

Some info here - https://support.opendns.com/hc/en-us/articles/227987...

Edited by smouty (Mon 12-Dec-16 10:39:54)