You basically need to pick a provider that can place a manual order with Openreach.
Most of the big players have their ordering systems setup to treat all orders as migrations/line takeovers.
When the order is placed correctly a new 1 port ONT will be ordered. Eventually the intention is this should trigger a 4 port ONT.
An issue with the 4 port ONT is some providers will only supply a service on port 1 of the ONT. BT Retail is 1 such provider. Sky and Talktalk (residential) also wouldn't provide on anything other than port 1 though that may have changed.
Part of the reason for this is simply that 4 port ONT's aren't common so the big players don't cater for them in their ordering systems.
Another reason is the likes of BT use Multicast which is only supported on port 1 of a 4 port ONT.
Edited by j0hn83 (Thu 27-Jan-22 10:07:17)