Hi @Junemoon1 Welcome to the community, yes you can use your existing phone once it's plugged into your new NBN compatible router which would be supplied by TPG with your new service, you do not need a computer to use the phone service.
Thanks for the details, I'll try and keep it simple, can you tell me what type of NBN connection you have? According to the lights that are lit on the modem it would indicate a HFC connection.
Can you hear any sort of tone when the phone is off the hook? What happens when you try and dial in and out?
I think its called hybrid? The phone makes no sound either on or off the hook. When I dial the phone says it is calling but nothing happens. I just got someone to ring me and they said it rang at their end but nothing happened here.
Yes I understand, If you've only had it connected today there's a good chance your number hasn't been ported yet, being a public holiday would affect this as well, one of the moderators will be able to check this for you and advise tomorrow.