i have a blackberry 8300 and it was bought in dubai..my problem is i dont know how to distinguish volts from 110 to 220volts. i have here blackberry usb travel charger...it includes 3 adapters..so pls help me..im here in the philippines right now and the volt that we are using is always 220...kindly advice me on this.thanks!

Check the writing on it.
The one I am looking at has 100-240Vac, 50-60Hz marked on it.

Every BB wall adapter I've seen has been that way. You should be fine.

You should be able to look on your charger as well...