BT Full Fibre order query

Just been able to make a new order for BT Full Fibre 900Mbps from BTs website. I was unable to do this last week when I checked, which I put down to COVID, but it seems like they now are actually taking orders (it only allowed me to select an installation date from 1/6 onward, but I won't move in until June so this is not an issue).

The monthly amount is 59.99.

A few questions

a) I got a phone line as well (I dont remember the order process giving me an option, but I want a phone line anyway). The property already has a phone line in it from previous occupants. Will I will be connecting my phone to the existing copper master socket or to the ONT?
b) I selected the 900Mbps speed but the email says the speed will be 910Mbps, but with a 'stay fast guarantee' or 455Mbps (which is a huge difference). Why is the guarantee so much lower?
c) I noted that the phone number given has a slightly different prefix than the ones for this area (at this exchange the first 3 digits are always 799 and have been for years, including last year at my current property which is very close by). Is this because the phone numbers for FTTP orders are different?

I note that during the order process it did have a warning about engineers coming into the property and making them aware of any conditions and making sure it's clean, etc. so I think that means that they are letting engineers in but managing the risks.

Thx.

1st June has been restart date for installs for sometime. Of course all subject to change, since no one can guarantee things

a) Preference likely to be for it to be digital voice i.e. from the BT Smart Hub (note ONT based voice has stopped). See (c)
b) Actually a Gigabit speed, 900 or 910 Mbps is the average speed time speed based on some sampling BT has done. The 455 Mbps guarantee refers to if you are getting slow throughput and its below that level using the BT testing conditions you can claim the £20. Its so much lower because you are not paying business grade prices that would guarantee higher speeds, but that runs to £100's a month.
c) Number ranges can run out, so maybe allocating from a different block and this might be more likely with digital voice

Re (a) - I was connected to FTTP at the end of Jan, and also was not given a choice about a voice line. (We stopped using landlines several years ago.) They in fact reconnected the copper, and even (because they stuffed up the reconnection) paid me some compensation for doing it late.

Note that the default package I was given did not include any call plan, so actually calling out on my copper line is ruinously expensive.

a) As Mr S says, you may have been given their new Digital Voice service - having been allocated a slightly different number prefix suggests you have

b) Bandwidth on consumer grade broadband services is always shared with others. No way on earth will BT (or any ISP) guarantee that you get 900 Mbps day and night, 365 days a year on their 1 Gig service. Better to have minimum guaranteed speeds than none at all. 455 Mbps is pretty good for a 1 Gig service, you only have to look at Hyperoptic who do NOT offer any minimum speeds on their Gigabit service. Then their users end up complaining why they're only getting 200-300 Mbps at peak time, having wrongly assumed they would be getting ~ 900 Mbps day & night in the absence of any minimum speed guarantee.

c) See a)

Just to add: on FTTP, up to 32 users are sharing a single fibre providing 2.4Gbps down and 1.2Gbps up. Hence even to guarantee 455Mbps, they are counting on no more than 5 users caning the link simultaneously. (In practice, average usage is far less than this)

MrSaffron and OP

The VOIP service will always come from a different 'call server' to a PSTN service until PSTN lines are migrated in full for that area, so will always have a different prefix to the existing PSTN lines, ( not the NNG ie 0SABC) that is the first 2/3 digits of the final 6/7 numbers.( but the DEF digits).

They are likely to be the same prefix for all the new VOIP lines in that number area, (NNG) until those are used up as OFCOM charge for each Number range. Then a new range will be allocated, or if a PSTN range has been completely migrated allocated from that range.

Ordered fiber 900 today. First person I spoke to said I could only order fibre 250. Rang up another team and they ordered fibre 900, provisionally booked for install June 2nd.

I ordered today but was given the 8th June....would have loved the 2nd June like you!!

I had this issue and still do which team/number did you speak to? Also what did BT.com say? As that says fibre 250 only for me too..

Just glad to get an order in, hopefully they won’t push it back. But I’m happy as I was so close to paying the roughly 10K for fttpod, but they did my street anyway!
Hope yours goes okay, says outside work will be done this Thursday on my order.