I think it will not be very useful and I don't know if anything like this is even possible but as programming is already surprising me every time it makes an impossible stuff possible. anyway, I think we should change mobile numbers into something better because they need really some improvement they are still like the old age systems.and also we should work on making everything inside virtual reality. man, that will be awesome.
And how we should change mobile numbers?
They are proven to work for a century, they are easy to use there have been no problem with the system , implementation and cost are as cheap as they can get, why thinkin we need something new?
Adding letters to it would mean insane cost, change of terminals worldwide it's just isn't feasible.
No point trying to invent something better than the wheel.