Roaming calculator
Pick where you're going, how long and how much data you use. We'll show what your phone company's roaming costs against the cheapest travel eSIM, using prices we've checked by hand.
Japan, 14 days, 14.0 GB, Telstra
You save A$107.29
Telstra roaming would cost A$140.00; the cheapest eSIM option we found costs A$32.71 for the same 14 days and 14.0 GB.
Your Telstra roaming
Cheapest eSIM options
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- Nomad 20 GB / 30 daysA$32.71
Checked 7 Nov 2026
- Airalo 20 GB / 15 daysA$35.00
Checked 7 Nov 2026
- Saily 20 GB / 30 days≈ A$36.20
Checked 7 Nov 2026
USD plan totals, savings and rankings use the manual conversion rate and are approximate. Providers charge in US$; confirm at checkout.
A worked example
A 14-day Japan trip on Telstra roaming costs A$140.00 (International Day Pass - Zone 2, checked 6 Nov 2026), vs A$32.71 for the cheapest eSIM option we found (Nomad 20 GB / 30 days, checked 7 Nov 2026) at medium use of 1 GB a day.
Frequently asked questions
How does the roaming calculator work?
It multiplies your phone company's published roaming price by your trip length and data use, then finds the cheapest eSIM plan, or combination of plans, that covers the same days and GB. Every figure comes from a price we checked by hand and is shown with that date.
How much data do I need per day overseas?
Light use, mostly maps and messaging, is about 0.5 GB a day. Medium use, adding social media and some browsing, is about 1 GB a day. Heavy use, with video and hotspotting, is about 2 GB a day.
Is a travel eSIM cheaper than roaming?
A 14-day Japan trip on Telstra roaming costs A$140.00 (International Day Pass - Zone 2, checked 6 Nov 2026), vs A$32.71 for the cheapest eSIM option we found (Nomad 20 GB / 30 days, checked 7 Nov 2026) at medium use of 1 GB a day.
Will I still get calls and texts on my Australian number?
Yes, if your phone supports two SIMs. Keep your Australian SIM on for calls and SMS codes, and use the eSIM for data. Turn data roaming off on your Australian SIM so you aren't charged for data.