Yes you can, assuming it is in good nick. (Many people on here have done that and I haven't seen a single report of a duff one).
Preferably get a Huawei HG612 3B, which has the white power plug as well as the 3B on the back. That is (a) the latest and doesn't have overheating problems, and (b) is easily unlocked if you want to do that to get line stats.
Don't pay much of a higher price for one that is already unlocked - it's easy.
You plug the HG612 into the phone line in the same way as the Home Hub. Then an Ethernet cable that comes with the router from that to the router WAN port. Your login username and password go into the router.
Edited by RobertoS (Wed 27-May-15 18:52:42)