Hi @ehsansim9304, we recently launched the My TPG App, but you won't be able to manage your mobile plan on the said app.
To view it's full coverage, you can visit this link:
TPG’s New Support App: My TPG
For now, you can log in to TPG My Account to view your TPG Australia Mobile plan service details.
Here's a community article that can guide you: Using TPG My Account & Online Account Info
