Unlimited plans are the most heavily marketed product in travel data, and for most trips they are not the best value. That is not a criticism of the plans — it is a mismatch between what they are built for and what most travellers do.
What “unlimited” means in practice
Very few travel plans are unlimited in the plain sense. Almost all carry a fair use policy: a daily or total threshold, after which your speed is reduced — sometimes to a trickle that will load a message but not a map tile.
So the honest description is usually “unlimited at full speed up to X per day, then slow”. Which is a perfectly reasonable product. It is just not the same product as the word suggests.
Before buying, find three numbers in the terms:
- The threshold — how much full-speed data per day or per plan
- The reduced speed — is it 512 kbps, which is usable, or 128 kbps, which is not
- Whether it resets — daily thresholds usually reset at midnight; total ones do not
If a provider will not tell you these, that is informative.
The maths that matters
Most travellers use 300–600 MB a day. The unlimited plans they are sold typically have thresholds of 1–2 GB a day.
That means the average buyer pays a premium for headroom they never touch. A right-sized fixed plan covers the same usage for less.
The comparison to run is simple: take your realistic daily usage, multiply by trip length, price a fixed plan of that size, and compare. If the fixed plan is meaningfully cheaper — and for typical usage it will be — buy that and keep the difference.
To estimate your own number, see How Much Data Do You Actually Need.
When unlimited is genuinely the right buy
Three cases, and they are real.
You are hotspotting a laptop. Working remotely changes the numbers completely. Video calls, cloud sync, large files — a working day can consume more than a tourist uses in a week. Here unlimited usually wins outright.
Your usage is genuinely unpredictable. If you cannot say within a factor of three how much you will use, the certainty is worth paying for. Running out mid-trip is disruptive in a way that overpaying slightly is not.
You will stream. Long train journeys, a hotel with bad Wi-Fi, kids with tablets. Video is the one activity that reaches the thresholds, and if you know you will stream, plan for it.
When it is not
Short city breaks. Four days of maps and messaging is not an unlimited-sized problem.
Trips with good Wi-Fi. If your hotel, your office and half the cafés have decent Wi-Fi, your mobile usage collapses to navigation and messaging between them.
Anyone who has checked their usage and knows the number. If you know you use 400 MB a day, buy for 400 MB a day.
The middle path
Buy a fixed plan sized to your honest estimate, then check your balance on day two. Two days of real data tells you the trend far better than any guess made at home.
If you are burning through it faster than expected, top up. Topping up takes about a minute and costs less than the unlimited premium would have across the whole trip. If you are using less than expected — which is common, because holidays involve being outside rather than on a phone — you have already saved money.
The one-line answer
Unlimited is a good product for people who will use a lot of data or cannot predict it. For an ordinary week away with maps, messaging and photos, a right-sized plan does the same job for less.