Hi krishna,
> Hi Yoon,
>
> Thank very much for your guidance. I followed the same procedure ...
>
> You already did following procedure.
> 1. ofono-phonesim -p 12345 -gui ~/data/moblin.xml
> 2. sudo ofonod -nd 
>
> And then, you need to type following command to power up modem(phonesim).
> 3. dbus-send --system --print-reply --dest=org.ofono / phonesim0 org.ofono.Modem.SetProperty string:Powered variant:boolean:true
>   
> I got below response....
>
> *Must use org.mydomain.Interface.Method notation, no dot in "phonesim0"*
It seems you wrote the command with a bad syntax, there shoudn't be any 
white space between / and phonesim0, the command is:

dbus-send --system --print-reply --dest=org.ofono /phonesim0 
org.ofono.Modem.SetProperty string:'Powered' variant:boolean:true

(I suggest using quotes rounding string constants).

Bye,
Dario.