No and yes.
If you have the font you can display any font on Android but default Android only have roboto font.
iOS has at least helvetica family of fonts and I believe it also supports custom fonts (please correct me if I'm wrong).
Edit:
I believe there is no build in fonts that are supported on all the platforms, BUT all platforms support custom fonts so you should just pick one and use it.
For iOS custom fonts see here: Can I embed a custom font in an iPhone application?
For Android custom fonts see here: Custom Fonts in Android
For Blackberry custom fonts look here: To set multiple fonts in blackberry
Hope that clarified a little