I want to change my phone and need to transfer bdm to my new phone but there is no obb and data it's more than 8gb now , when we get obb of the game, Or maybe I root my device.

Here's an idea: how about REDOWNLOADING THE GAME like a regular person?

I think I understand his frustration because not everyone can afford to have fast unlimited mobile data.

Maybe you can go somewhere where there is a wifi connection and re-download it?