if you have more than one ISP service they change the ONT to a four port one (These are four Ethernet outputs), you do not need anymore 'drop' fibre lines
They do not currently.
As has been mentioned numerous times this is not the current process.
Although you don't "need" another drop cable and another ONT, that is the current process for a 2nd service for anyone with a 1 port ONT.
OpenReach are starting a process where a 4 port ONT will automatically be ordered when you order a 2nd service. I believe this hasn't started yet though.
It is also only applicable to Nokia ONT's.
They haven't yet announced any such process for Huawei ONT's.
The current 4 port Huawei ONT's are apparently rare as hens teeth.
The upcoming OpenReach Nokia 4 port ONT is an existing model from Nokia's GPON range of ONT's but with the phone ports removed.
OpenReach may be waiting on Huawei supplying new 4 port ONT's. If so it would likely be a different model without the phone ports.
As you say though, if/when you do get supplied a 4 port ONT you don't need another drop cable.
The single strand of fibre in the drop cable can support up to 4 services on a 4 port ONT.
Edit: added a little info
Edited by j0hn83 (Fri 13-Aug-21 13:38:32)