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Who called from www.undergroundopera.com.au?

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If www.undergroundopera.com.au keeps calling, here is how to block it on common Australian devices and services. Tap a section to expand.

On iPhone

Open the Phone app and tap Recents.
Tap the info (i) button next to www.undergroundopera.com.au.
Scroll down and tap Block this Caller, then confirm with Block Contact.
To screen every unknown caller, go to Settings > Apps > Phone and turn on Silence Unknown Callers.

On Android

Open the Phone app and go to Recents (or Call history).
Tap and hold www.undergroundopera.com.au, or tap it and open the three-dot menu.
Choose Block / report spam and confirm.
In Phone settings, turn on Caller ID & spam protection to flag likely spam calls automatically.

Carrier & regulatory options

Ask your carrier (Telstra, Optus, Vodafone, TPG and others) about network-level call blocking or scam call filtering on your service.
Register your number on the Do Not Call Register to stop most telemarketing calls. Scammers ignore it, so still block www.undergroundopera.com.au.
Report scam calls to Scamwatch so the National Anti-Scam Centre can warn others.
Telemarketing that ignores the Do Not Call Register can be reported to the ACMA.