social.tchncs.de is one of the many independent Mastodon servers you can use to participate in the fediverse.
A friendly server from Germany – which tends to attract techy people, but welcomes everybody. This is one of the oldest Mastodon instances.

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@gborn I see that the person that did the API work at Optus must have moved to Deutsche Telekom...

@gborn a similar thing works for mobile connections as well. You can request endpoint configuration data without any specific permissions (except Internet access). Which includes the users phone number.