You can use some other wifi router as long as it supports a VLAN ID=2 setting (not all do). If you want to use a 3rd party voip provider but stay with TPG for internet, there are options: -get a real voip phone and connect to LAN port on router; program phone with provider settings; probably not worth it. -get an analog telephone adaptor (ATA), connect it to LAN port on router; connect your standard phone to ATA; program ATA with your provider details. -get a router that has voip function built in; connect your standard phone to the phone terminal on router; program router with your provider details. I don't know what issues you might have in either keeping whatever phone number you have now or getting a new number. This thread has posts from various users relating to voip. https://community.tpg.com.au/t5/Home-Phone-Voice/VOIP-set-up-TP-link-VC321-G2H/m-p/75436#M7464
