Specifics of Mechanical Engineering & College Advice?

[Curious George]

So I asked a question earlier about designing cell phones and I figured out that I want to become a mechanical engineer...

However, when I think of mechanical engineering, I think of cars and engines, etc. So can someone please reassure me that I would be able to design cell phones and other electronics with a mechanical enginering degree... I wouldn't need an electrical engineering degree for that, right?

Also, would it be too much if I double majored in Japanese? If take AP Calculus BC, and AP Physics C, as well as AP Chemistry, would it make more sense to double major or just to minor in Japanese?

Please someone! Advice really wanted!