This topic

BT broadband upgrade from ADSL to Fibre (along with Digital voice)

Elaine2020 — Sat, 20 Dec 2025 15:47:41 GMT

Hi,

I've recently been notified that I'm being upgraded from my current ADSL broadband to Full Fibre as well a getting Digital Voice. Engineer is due to come next month to install it.

When I track the order in my BT account, it states that the Fibre package is Fibre 1, however when I checked the broadband deals available Fibre 1 doesn't appear to be available and was wondering if anyone might know which broadband package I'm likely to be getting and likely speed when I'm upgraded to Full Fibre?

I'm assuming that I'm likely to be getting the basic Fibre package?

My router is currently downstairs and I'm likely to keep the new router in the same place when they're installing it. I've also got a landline phone upstairs and was wondering if the engineer may need to install anything there, although I'm aware I'll need to get the phone adaptor if I want to continue using existing phone with Digital Voice.

Any advice/comments you can give is greatly appreciated.

Re: BT broadband upgrade from ADSL to Fibre (along with Digital voice)

licquorice — Sat, 20 Dec 2025 16:29:34 GMT

First and foremost, broadband packages are entirely independent of medium of delivery. Prices for a given package are the same whether delivered by copper or fibre.

If you intend the router to remain where it is, you can simply disconnect the incoming copper pair when the fibre is provided and then just connect the green socket at the rear of the hub to the master socket with a double ended BT431-BT431 cable and your extensions will work as before.

Re: BT broadband upgrade from ADSL to Fibre (along with Digital voice)

WSH — Sat, 20 Dec 2025 16:41:22 GMT

I’m not an expert in this area but as no one else has answered this…

As far as I’m aware Fibre 1 is up to 55 Mb/s and is the same cost/speed regardless of whether it is delivered over copper or fibre.

Full fibre requires the installation of an ONT (Optical Network Terminal). The router connects to this instead of the phone socket. This is a small box on the wall about the same size as a master socket. If you want it in a different location, you will have to ask the installer. Within reason, they will put it where you like. It doesn’t need to be in the same position as the old master socket, but it does need power and so must be within about 1.5m of a power point/extension lead etc.

With Digital Voice (DV) the phone will now plugs into a socket on the back of the router. If this is not a convenient location, you can get an adapter that is basically a plug-in phone socket. The phone then plugs into that and it uses DECT (the same technology as cordless phones) to talk to the router.

Hope that helps.

Edit: Typing at the same time as Licquorice.

Re: BT broadband upgrade from ADSL to Fibre (along with Digital voice)

iniltous — Sat, 20 Dec 2025 19:26:11 GMT

If you are migrating to DV and are also getting a migration to FTTP at the same time , the speed profile is whatever you currently have , so if you have F1 (upto 55Mb )then that continues when you are on FTTP , the only difference is if you don’t currently get the maximum 55Mb from FTTC because if the distance you are from the cabinet , you see an increase to 55Mb because there is no rate reduction because of distance, if you get the full 55Mb anyway , there won’t be any noticeable difference.
Checking deals with BT only shows a selection of products not the entire range , plus if already on F1 there isn’t much point showing you F1 if that’s what you are already on

Re: BT broadband upgrade from ADSL to Fibre (along with Digital voice)

Elaine2020 — Sat, 20 Dec 2025 20:07:49 GMT

Hi liquorice,

Thank you for your comments. Your solution for the upstairs telephone sounds ideal. If I use a double ended BT431- BT431 cable to connect the hub to the master socket, I am assuming that I wouldn't need to use a digital voice adaptor as there is an extension phone line running from the master socket to the upstairs phone?

Re: BT broadband upgrade from ADSL to Fibre (along with Digital voice)

licquorice — Sat, 20 Dec 2025 20:12:10 GMT

Indeed

Re: BT broadband upgrade from ADSL to Fibre (along with Digital voice)

Elaine2020 — Sat, 20 Dec 2025 20:14:39 GMT

Hi,

Thank you all for your replies.

Sorry for the confusion but I'm not currently on any Fibre package at the moment as FTTC wasn't available where I am and could only get ADSL previously. So still have a full ADSL connection and am only getting about 5 Mb/s which is the maximum speed I can get due to distance from the exchange. Therefore I am assuming that when moving to Full Fibre I should be getting up to 55 Mb/s?

Re: BT broadband upgrade from ADSL to Fibre (along with Digital voice)

WSH — Sat, 20 Dec 2025 20:23:31 GMT

As @iniltous said, with "Full" Fibre (FTTP) there is no up to. That only applies to Part Fibre (FTTC). My mistake. With full fibre it will be 55 Mb/s spot on.

Re: BT broadband upgrade from ADSL to Fibre (along with Digital voice)

Elaine2020 — Sat, 20 Dec 2025 20:24:00 GMT

Hi Licquorice

Thanks for your reply.

I've also got a phone downstairs which is next to the router and am aware that we would need to plug this into the hub, however if we are using the double ended BT431-BT431 to connect the hub to the master socket, can a double phone socket adaptor be inserted into the hub to allow it to be connected to the master socket and the downstairs phone at the same time?

Re: BT broadband upgrade from ADSL to Fibre (along with Digital voice)

WSH — Sat, 20 Dec 2025 20:25:35 GMT

Yes.

Re: BT broadband upgrade from ADSL to Fibre (along with Digital voice)

licquorice — Sat, 20 Dec 2025 20:36:49 GMT

Yes

Re: BT broadband upgrade from ADSL to Fibre (along with Digital voice)

chrisjp — Sat, 20 Dec 2025 22:28:23 GMT

"I'm aware I'll need to get the phone adaptor if I want to continue using existing phone with Digital Voice."

If you can plug your existing phone into the socket on the back of the Smarthub 2, you do NOT need the BT adapter to get DV. The "adapter" is, in my view, confusingly named by BT. ANY corded phone will work on DV when its cord is plugged into the Hub. The adapter is only needed if you want to use a corded phone somewhere other than where the Hub is located. It would be better called a "portable phone socket".

Re: BT broadband upgrade from ADSL to Fibre (along with Digital voice)

iniltous — Sun, 21 Dec 2025 09:05:55 GMT

If you are one of the small number still on ADSL (so served from the exchange rather than FTTC served from a cabinet ) , the product you presumably are on is an upto 24Mb one (I can’t recall it’s product name , obviously it doesn’t include the word ‘fibre’) , was marketed as 17Mb and , you state you get around 5Mb, so I’d estimate that puts you 4-5Km from the exchange…it’s very rare to not have been offered an FTTC upgrade path in the past .

TBH , your change to FTTP would need to be checked with BT , as far as I know the basic FTTP profile is 40Mb (sold as BT Essential, not to be confused with Home Essentials the social tariff) so I’d suspect you will be moved onto that , but as an ADSL customer not FTTC /VDSL there is no directly comparable FTTP equivalent , if it happens to be F1 you get ( re reading your original post that may be the case ) , unlike most , I suspect you will see a price increase unless your ADSL price were more than the current F1 price , but I’d struggle to see how this can be achieved without some contractual tie up , as you , unlike FTTC to FTTP migrations are not simply changing the transmission medium .