Samsung Galaxy S8

If there's no credit on your prepaid phone card, you can't make calls until you've topped it up.

Solution: Top up your prepaid phone card.

You'll be notified if your number has been suspended when you try to make a call.

Solution: Contact customer services to have your number reactivated.

When flight mode is turned on, all wireless connections on your mobile phone are turned off, including the connection to the mobile network.

Solution: Turn flight mode on or off

When you turn on fixed dialing, you can only call predefined numbers and do emergency calls.

Solution: Turn fixed dialing on or off

If your mobile phone is overloaded, you can't make any calls. It may help restarting it.

Solution: Restart mobile phone

You can check if your SIM is faulty by inserting it in another mobile phone.

Solution: Contact customer service or find an Optus dealer using our Store Locator.

The network coverage may differ from area to area. In certain areas it may so low it's not possible to make calls.

Solution: Try making a call later when you're in an area with better network coverage.
View our network coverage map.

If there's a general problem making phone calls in a certain area, it may be be due to a temporary network error.

Solution: Try making a call later or when you're in another area.

If you're having problems calling a specific number, the error might be at the receiving end.

Solution: Try making a call to another number.

If you've set your mobile phone to use a specific network, it can't get a network connection if the selected network is out of range.

Solution: Choose a network

If you've set your mobile phone to use a specific network mode, it can't get a network connection if the selected network mode is out of range.

Solution: Choose network mode

If you try to make calls to or from foreign countries, roaming needs to be activated in your rate plan.

Solution: Call 1509 from Australia or +61 2 8082 5678 when abroad. If you're already abroad, you need to use another mobile phone.