Hi! My mobile number is [MODERATION]. My account number is [MODERATION].
I can't make any international phone call. I have 300 minutes international call in my plan.
Also, when I call others, my number is not showing.
Firstly I would suggest you edit your post to remove your phone number and account number as this is a public forum.
For international calls it may work if your dial 0011 and not +11. Give it a try.
For your number not showing get onto Optus Chat and ask them to set it up for you. When I first joined Optus had the same problem and that was the only way to sort it.