As you require a voice service as well, I think only BT supply a voice service over fibre (FVA) so you'd be limited to them.
This is true, the only downside to moving your phone over to FVA is that you cannot use any of the BT online stuff like Speed Test, Check what pakages are available to you, BT Wholesale Speed Test etc when using your phone number.
Also if you are wanting to leave BT when on FTTP and phone via FVA, and move to say Zen etc, the checks will fail due to the phone number even though its still the same number as before will be unrecognized and fails to report fibre.
Well it does in my case, BT are aware of this and said they plan to resolve this but its been 9 months so far and its still broken.
So you need to be aware of this before adding you phone to FVA.
Apart from that and a few issues now and then which an email resolves quickly I think BT are not that bad for what you are paying.
So overall I am happy so far, granted I have only had FTTP for since November last year.
*** update ***
I stand corrected, Zen now checks both phone and full address when checking, so its ok with them.
Edited by PaulKirby (Wed 23-Aug-17 19:36:39)