How to view websites from unity on iPhone and Android

I was wondering if anyone has attempted to make in an in game store button that sends you off to a website to purchase items.

With what I know of Unity, I believe the would be accomplished by its messaging system, right? Or, is there another easier way of doing this?

Also, would I have to write a plugin for the Android in Java? Android builds are not much like iPhone builds-- I don't see the java before I build things.

Thanks for your comments in advance.

 

You could use Application.OpenUrl(StringURL). Check this unity answers post for more info.