eSIM vs roaming. It's not even close.
A typical 2-week trip on a carrier day-pass: $140+. The same trip on Anon eSIM: $10–20 for most travellers.
How the two models actually work
Carrier roaming bills a flat daily fee ($10–16 from most North American, UK, and Australian carriers) every calendar day your SIM touches data abroad, drawing on your home plan's allowance - often with a few hundred MB of full-speed data before throttling. The fee triggers whether you used 5 MB or 5 GB, resets at midnight, and stacks silently for every day of the trip.
A travel eSIM connects to the same local networks through wholesale roaming agreements and meters what you actually use. Anon eSIM charges published per-GB rates ($0.70–$2.80 by country) from a prepaid balance - a light day costs cents, a heavy day just draws the balance down faster, and nothing expires. Your home SIM stays installed for calls with its data roaming switched off.
The math, trip by trip
| Scenario | Carrier roaming | Anon eSIM |
|---|---|---|
| Weekend in Paris (2 GB) | $30 | $1.60 |
| 2 weeks across Europe (10 GB) | $140 | $8.00 |
| Month in Bali (15 GB) | $300+ | $18.00 |
| Business trip to Tokyo (5 GB) | $70 | $8.00 |
Roaming column: typical $10–15/day day-pass pricing × trip days with data use. Anon eSIM column: published per-GB rates (France $0.80, Indonesia $1.20, Japan $1.60) × data volume - verify any line on the rates page. Not sure how much data you'd use? See our field numbers per activity.
Where roaming still wins
Honesty corner: a one-day hop across a border, where a single $12 pass beats any setup step. A work phone you're not allowed to modify. And receiving calls on your own number with truly zero configuration - though dual SIM gives you that anyway alongside eSIM data. For everything else, the day-pass model charges you ten times the underlying cost of the data.
Roaming alternatives hub
Carrier-specific breakdowns of the day-pass / roam-like-home products travellers replace most often:
Three Go Roam alternative
UK Three's 12 GB roaming cap and covered-country list, and where PAYG wins.
Rogers Roam Like Home alternative
Canada's $16/day model vs a $10 top-up for two weeks.
Bell Roam Better alternative
Bell's daily fees and hotspot throttling vs full-speed PAYG.
Telstra International Day Pass alternative
AU day passes ($10-15) vs $12-30 USD for a full three-week trip.
Metro by T-Mobile international roaming alternative
2G-class Metro roaming vs local 4G/5G on a PAYG eSIM.
Cruise ship roaming alternative
$10+/MB satellite billing at sea, and how to switch the moment you dock.
FAQ
Why is carrier roaming so much more expensive than an eSIM?+
Day-pass roaming is priced as convenience insurance, not as data: a flat $10–15 fee per day you touch data abroad, regardless of how little you use. A travel eSIM buys the same local-network data wholesale and charges per GB - so a light day costs cents instead of a flat fee.
When is carrier roaming actually the better choice?+
One or two-day trips where a single day-pass fee is tolerable and you don't want to install anything; and anywhere you must keep your own number active for calls with zero setup. For anything longer, the day fees dwarf the data's real cost.
Do I lose my phone number by using an eSIM?+
No. Dual SIM is the standard setup: your home SIM stays active for calls, texts, and 2FA (with its data roaming off), and the eSIM carries data. Nothing about your number or plan changes.
How were the comparison numbers calculated?+
Roaming figures use typical published day-pass pricing from major North American, UK, and Australian carriers ($10–16/day). Anon eSIM figures use our published per-GB rates (e.g. France $0.80, Japan $1.60, Indonesia $1.20) times the stated data volume - all checkable on the rates page.