Could you clarify what you mean by and "gb studio mobile" ?

The official editor does run on iOS or Android. You can't create or edit GB Studio projects on a phone/tablet natively.

The version attempts to replicate this visual interface on a touch screen, allowing for the entire lifecycle of game development—asset creation, logic scripting, testing, and exporting—to happen on an Android device.

It realizes the dream of "bedroom coding" in its most literal sense—you can lie in bed and create a Game Boy game.