Hi @nicolaou1942 ,
Welcome to the Community!
You currently have the Big Talk which inlcude:
If you need more mobile minutes, I would recommend switching over to the OZ Talk. I believe this add-on will suit your needs better. The OZ talk includes:
You may switch over your add-on by logging in to your TPG online account: Using TPG My Account & Online Account Info
Feel free to let us know should you require further assistance.