I don't think I follow, sorry! I did use GB Studio, yes, and I've ported a previous game to Windows, Steam, and 3DS, plus used all the built-in GB Studio options. Do you mean mobile like Android and iOS? I actually looked into making an Android .apk out of the build sometime as well, using a similar process to the Windows port process, but I'm definitely open to easier methods if you have any resources to share!