Sunday, May 27, 2018 at 07:51
Roaming is the same thing as International roaming. There is no such thing as national roaming in Australia ( though Vodafone wants it so a vodafone user can use Telstra's country network). Telstra won't allow you to roam to another network in Australia and visa versa. There is one exception to this, which is not strictly roaming, if you dial 112 or 000 and have no coverage from your provider, and there is another one available then your phone can make calls from any network.
When using a normal Telstra SIM in an Iridium satphone, you roam to a country called "Iridium" which has country code 8816 or 8817. Since Telstra have a roaming agreement with Iridium, you can roam to that 'country'. Albeit at a high cost, just like you could roam to say Zimbabwe at high cost.
Telstra doesn't have roaming agreements with the other Sat phone providers, and Optus and Vodafone don't have roaming agreements with Iridium.
To stop the phone roaming, with high phone bills, you have to let it connect to telstra, that happens automatically when you return from ( say) Zimbabwe when you get
home. On a Sat phone you physically have to move the SIM to a local phone to tell Telstra's network not to roam.
The alternative is to turn off international roaming online on your Telstra personal account page. That is what I do.
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