Which one is truly smartphone?

[sumukh phalle]

1) windows os
2) android os
3) ios
4) blackberry os
5) other

 

[etad putta]

all of the above, next question please....

 

[RumoredNow]

Different tools fit different user styles...

I could add at least 8 more equally valid choices to the list. Try some and see which one fits you best, then go with that.