Dual booting of Smartphone

[Abhijit Pawar]

Hi All,
I know its pre-mature to ask this question but is there any support of
dual booting in smartphones which can allow me have two different OS's
( for ex. Android 2.1 + Android 2.3 ) on a single phone? There may be
other combinations as well. Is this something which we are looking at
near future or is it just a dream at this moment?

Regards,
Abhijit Pawar