We travelled the Plusnet to Virgin route in winter of 2017 / 2018 and this is what we did ...
1. Will I be able to continue using my Netgear Orbi routers? ( I don't have this product but I don't see why not )
2. Can I continue to use my Netflix account
or must I change it to Virgin Stream? ( Yes, we have a stand-alone Netflix HD a/c & no VM TV services )
3. Virgin state I should be able to keep my landline phone number but they then state they will contact me if this is not possible. When would I know if it is not possible and would it then be too late to cancel the application? ( We left our landline & Plusnet ISP services in parallel for 2 months until the VM service was running and then ported the BT number to Sipgate a VOIP provider. We connected existing phones + house alarm to a Cisco SPA 112 Analogue Telephone Adaptor that is connected the the VM Hub. On porting a BT number to a VOIP providers or to VM the BT a/c is promptly terminated for phone and any broadband services )
4. Can I still use my phones or will I have to scrap them and buy new phones? I have standard Panasonic cordless phones with an answer phone base station. ( Most BT style analogue telephones can be used with Virgin's phone service as provided from the Hub's RJ11 analogue phone sockets. A small RJ11 plug to BT socket adapter is used. The exact same adaptors are used with the Cisco ATA )
5. Is there anything else I should consider in changing from ADSL to fibre?
( Virgin Media installation delays often occur, so if possible avoid cancelling the existing ISP arrangements until Virgin Media goes live. A couple of months of Plusnet and Virgin is easier to live with than no internet. Regarding existing phones keep a firm grip on the RJ11 to BT plug cables that are with the existing phones - not all phones use the US RJ11 standard - some will only work with the factory supplied cables.
If you wish to take the existing phone number to Virgin the option to hold the line & Plusnet in parallel goes away, so consider if there was a bit of delay from the cut over could you perhaps get by using you mobile phones as hotspots ?
Be aware that M125 (132/20 Mb/s) is lots faster than a 40/10 FTTC service. With VM it is super easy to over buy bandwidth.
You can see Virgin Media connection boxes on the out side of homes - I'm sure the folks would not mind if you asked them how is the VM service.
Thanks for any advice you can give. ( Fire away if you think of anything else. The only daft questions are the ones you wished you had asked )