From my own experience, this can be pretty straightforward, but there are potential traps, and depending on your circumstances, the sequence and timing can be important.
Firstly, there's a useful guide to the process and pitfalls at
https://www.ispreview.co.uk/index.php/2019/04/swappi... (Jump to page 3, you already know the basics ... )
Secondly, already having a VOIP provider should (!) make life easier.
Thirdly, the provision of FTTP is entirely separate to your existing copper service, so the only consideration in running the two side by side is cost. If you can afford to do it for a month or two, it is well worth considering, in case of problems with the new service.
In my case, once I was able to wake OR up to the fact that the FTTP infrastructure was already in place (Duh...!), and being out of contract with TTB (ADSL), I ordered FTTP from Cerberus, and let the two run for a couple of months, which gave me the time to assess VOIP providers and satisfy myself that all was well with the FTTP provision. I then signed up with my chosen VOIP service (Vonage), and requested porting of the TTB landline phone number; this automatically sent a cease service request to TTB, and after the required notification period, the changeover proceeded seamlessly. No problems since! (Fingers crossed.)
I don't know what sort of delays are likely with FTTP installation in the current circumstances, so I suggest getting your FTTP order in soon. With 3-4 months to run, the penalties for early termination of your current contract should be fairly reasonable if the installation is quick, and if longer, then a month or two at out-of-contract pricing should also be bearable.
I hope the above is helpful and not stating too much that you didn't know already.
Good luck with your plans!
Edited by Mygri (Fri 09-Oct-20 17:30:45)
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