How to Call Optus From Abroad
9/9/2026
Quick answer: Call Optus from overseas at +61 2 8082 5678. The everyday domestic line, 13 3937, is a "13" number and won't connect once you're outside Australia.
Why the everyday Optus number doesn't work overseas
Optus's main customer service line uses Australia's "13" call-routing format, which only functions within the country's own phone network. Optus's overseas-reachable number is a standard Sydney geographic number instead, which behaves like any other international call: add +61, drop the leading 0.
The verified number
| Line | Number |
|---|---|
| Optus, calling from overseas | +61 2 8082 5678 |
Source: Optus's international support documentation. Optus's domestic line, 13 3937, runs Monday to Friday 8am-9pm, Saturday 9am-7pm, and Sunday 9am-6pm, for reference on likely overseas hours too, though Optus doesn't publish separate hours for the overseas number itself.
What to have ready before you call
- Your Optus account number or mobile number
- The address registered on your account
- Details of the specific issue: billing, a service fault, or a roaming question
Best time to call
Optus's domestic hours (Mon-Fri 8am-9pm, Sat 9am-7pm, Sun 9am-6pm AEST) are the best guide for the overseas line too.
- UK: Australia is 9 to 11 hours ahead, depending on daylight saving, so call in your evening.
- US East Coast: Australia is 14 to 16 hours ahead.
- UAE/Gulf: Australia is 6 to 8 hours ahead.
- Singapore/Hong Kong: Australia is 2 to 3 hours ahead.
The cheaper way to actually make the call
This is a standard chargeable number, so full international rates apply for the whole call, hold time included. With DialVia, you call the real Optus number over Wi-Fi from your browser instead:
- Open DialVia and sign up (about 30 seconds)
- Select Australia as the destination
- Enter the number: 2 8082 5678
- Hit call
Frequently asked questions
What's Optus's number for calling from abroad? +61 2 8082 5678.
Why doesn't 13 3937 work from outside Australia? It's a "13" number, a special domestic call-routing format that only works within Australia's own phone network.
Is Optus's overseas number toll-free? No, it's a standard chargeable Sydney number.
What should I have ready before calling? Your account or mobile number, your registered address, and details of the issue you're calling about.
Need another Australian telecom provider's number? See the full guide to calling Australian telecom providers from abroad, covering Telstra and TPG too.
👉 Try DialVia to call from your browser in 30 seconds. Didn't connect? You don't pay. Or return to the DialVia homepage to learn more.