[i.h]

They could always use the ITV Digital way of rebranding equipment. send out EE stickers to cover up any old BT logos. That way, you will be upgrading your devices to the latest technology 

media.onhistory.co.uk 

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networking equipment would be constantly refreshed to keep up to date date with new features and security. As part of that cycle, if probably wont not be too difficult to integrate with other networks. Thanks to open standards, vendor interoperability should not be a showstopper. It would mostly require layer 3 routing changes.

Three for example recently migrated its Nokia cloud core network, and whilst this is a mobile operator, it's still IP based.

Yes, I remember getting those stickers. I think I did use them too...

It isn't so much the physical network but the logistics that would make it a major undertaking (esp. if there are complications like customers with static IP addresses) which is probably why they haven't done it yet even though there are benefits, as the BT broadband network clearly has been the focus of investment and with bells and whistles such as IPv6 which EE and Plusnet never had.

Given the emergency alert debacle, I don't think anyone's going to take network engineering lessons from Three any time soon