People calling you should refer to their phone provider to confirm how much it will cost to call you on your RoamingSIM. While you have your local landline number for Australia, your friends and family will be charged a local call only.
By default, your SIM is set up with a UK Mobile number unless you have a local number enabled this is the rate callers will be billed for when they call you.
Learn more about setting up local numbers on your RoamingSIM here.
Visit your account page here.
Dial *120# and press call on your mobile phone. Your balance will then be displayed.
These two frequently visited countries require a phone that is 3G enabled and can support the frequency WCDMA 2100.
Refer to you phones manual, or contact the manufacturer to confirm that your phone meets these requirements.