In the last couple of weeks I've seen assorted presentations talking about "single identities". Apparently, we'll all rely on our operators to give us a single sign-on for all our telecom services, most of which will be done by the operator themselves, and the rest through close, trusted partners.
There's a word for this, which starts with "B" and ends with "ollocks".
I've got seven primary communications identities (2 SIMs, fixed line, ISP, Yahoo, Google, Skype) and many more secondary ones. This is likely to increase, not decrease.
For a start, unless an operator offers me guaranteed "identity portability", I'm obviously not going to trust them to host all my various log-ins, as I don't want to lose anything when I churn. Customers aren't stupid - they know a lock-in policy when they see one. You can add "content portability", "email portability", "address book portability" and "payment portability" to that as well.
Secondly, I can't see any of these providers relinquishing control to the others. If I decide to forgo my SIM, and try & authenticate with O2 via Skype or Yahoo!, I'm not convinced I'd be able to. Or authenticate my T-Mobile phone via O2's network.
Bottom line - drop the the "one identity" Powerpoint bullet, and put it in the bin alongside "one device", "one address book" and so on.