Advice

[dave316]

Looking to replace my talk talk fibre modem/ router with this will it work

[michaelkenward]

What sort of Internet does the execrable TalkTalk deliver to you?

The D7800 does VDSL and ADSL.

[dave316]

They supply 38mb to my house

[michaelkenward]

Yes, but how?

Probably VDSL. In which case the D7800 will work.

[dave316]

it is provided via my pre fitted phone socket with an RJ11 cable from it to my modem

[michaelkenward]

Once again, that tells us nothing about the service that TalkTalk is throwing at you.

Try asking on the TalkTalk forums. There will be more Netgear users there than there are TalkTalk customers here. For example here is one message that might help:

Setup a Netgear D7800 AC2600 for TalkTalk Fibre - TalkTalk Community