Georgia is a system font which means it doesn’t make a font request as it ‘expects’ the local device to have that pre installed.
However, not all devices have the same system fonts. And although Georgia may be something installed on a Win/Mac desktop device it probably is not going to show up on mobiles, which means it will default to the devices system font. In the case of Android devices that would probably be Roboto ( or one Googles Droid fonts ).
If you want Georgia to appear on all devices you would have to serve the font locally – which would require you acquiring a ( maybe licensed ) copy of the font