Can I get a refund for unused eSIM data?

Almost never once the plan is activated. A few brands offer a cooling-off refund before activation, but the moment you scan and switch it on, the unused portion is non-refundable. Always check the refund terms before you buy.

Do eSIM plans expire?

Yes. Traditional eSIM plans come with a validity window (commonly 7 or 30 days), and any data left when it ends is wiped. soda works as a wallet instead, so the balance has no expiry date.

Can leftover data roll over to my next trip?

With traditional fixed plans, almost never — the data is locked to that one window. Only the rare rollover plan keeps it, and travel eSIMs generally don't offer that. Because soda stores money rather than data, your balance is simply there next time.

Is it cheaper to buy a big plan or a small one?

Only if you finish it. A big plan's lower per-GB price evaporates the moment unused data expires. If you're unsure, buy small and top up, or skip the guessing entirely with pay-as-you-go.

I already activated it. Can I still get a refund?

Usually not. Cooling-off refunds almost always require that the eSIM is still unactivated. So confirm your phone supports eSIM and that you actually want the plan before you scan the code.

What happens to leftover eSIM data?

With most travel eSIM plans, leftover data isn’t refunded and doesn’t roll over. When the plan expires, whatever you didn’t use is gone. Worth knowing before you buy, not after.

Think back to your last travel eSIM. Was there a chunk of data still sitting there unused? That’s normal. As how much data do you actually need covers, people tend to overestimate and buy big. The trouble is what happens to the part you didn’t touch. Leftover data is, plainly, money thrown away.

”Leftover data” usually means one of three things

Policies vary by brand, but here’s the common shape of it:

It expires. The most common case. A plan has a validity window, say 7 or 30 days. When it ends, unused data is wiped. No refund, no extension.
It’s non-refundable. Almost every prepaid plan won’t refund the unused portion once activated. Some offer a cooling-off refund before activation, but not after.
It doesn’t carry over. The data is tied to that one plan and that one window. Whatever’s left doesn’t become credit toward your next trip.

How each buying style handles leftover data

Line the common options up and the difference is obvious:

Buying style	Leftover data	Validity	Refundable?
Traditional fixed plan (e.g. 7 days, 5GB)	Wiped at expiry	Locked to a window	Usually not, once activated
”Unlimited” plans	No leftover concept, but throttled past a cap	Locked to a window	Usually not, once activated
Rare rollover plans	Carries to the next period	Still expiry-bound; lost if it lapses	Usually not
soda (pay-as-you-go wallet)	There is no “leftover”	Balance never expires	Unused top-ups refundable within the cooling-off period

(The table reflects common industry practice; each brand sets its own terms.)

Why leftover data can’t be refunded or kept

This isn’t carriers being difficult; it’s the nature of the plan. Buying “7 days, 5GB” actually buys “the right to use up to 5GB within the next 7 days.” It’s tied to a window of time. Once that window closes, the right ends, and the unused part doesn’t turn into savings you keep.

That also explains a common trap. Plans usually get cheaper per GB the bigger you buy, which nudges you to size up. But buy big and fail to finish it, and the wasted data eats the per-GB saving you were chasing. “Cheaper per GB” only holds if you actually use it all.

A few carriers offer rollover, carrying this period’s unused data into the next, but travel eSIMs almost never do, because they’re built as short-term, use-it-or-lose-it products.

Putting numbers on the waste

Take a typical case. You buy a “10 days, 10GB” plan and end up using only 6GB across the trip — common, because hotels, cafes, and stations are full of Wi-Fi. The remaining 4GB vanishes at expiry. If that 10GB cost $30 (an illustrative figure; actual prices vary by brand), you paid roughly $12 for data you never touched, about 40% straight down the drain.

The more awkward version is the opposite: you buy big, yet on the last day you still run short and panic-buy a small extra pack. Now you’ve managed to overbuy and underbuy on the same trip, losing at both ends. That’s the hard part of any fixed plan — it makes you bet on the right number before you leave, and nobody guesses it perfectly.

How to waste less on a traditional plan

If you’re still on a fixed plan, two habits cut the waste. First, buy small and top up if needed; a mid-trip top-up beats starting with a slab you won’t finish. Second, size it off your real usage rather than forcing a big plan to match the number of days.

Why soda doesn’t have this problem

soda doesn’t sell a bundle of data. It’s a top-up wallet that bills by what you use. The difference is right there: a plan is tied to data with an expiry; a wallet holds money.

The balance doesn’t expire. You’re topping up money, not data with a clock on it. Didn’t finish this trip? It’s there for the next one, not wiped after 30 days.
There’s no “leftover” to speak of. You never bought a size in the first place, so there’s no unused slab to waste.
The lowest total is applied in retrospect. At the end of the trip, every available combination of plans is compared and the lowest total is applied, so heavy use still costs no more than picking the right plan upfront.
Unused top-ups can be refunded. Within the cooling-off period, you can request the refund yourself from the wallet page.

So “what do I do with leftover data” is a non-question with soda. You can’t overbuy, because you don’t buy a size upfront at all. The pricing logic is in why you shouldn’t gamble on a travel data plan; before travelling, it’s also worth confirming your phone supports eSIM.

(Each brand sets its own terms; the above describes common industry practice.)