Hi @Buckersz,
Yes, you may add another SIM only plan within your existing account.
The cost will depend on the plan that you are going to choose. You may refer to http://tpg.com.au/mobile for more information.
We can also arrange a call from our Mobile experts to discuss this further and assist you with your order. Just send me a private message with your preferred time and best number to be contacted.
How to send a PM? Click here.
Regards,
BasilDV
