For a short Polish city break, first check whether your existing mobile contract already supplies enough travel data. For a longer stay or a separate data line, compare the same allowance and expiry window. A larger package and a longer validity period solve different problems; do not substitute one for the other.
Prices checked 10 October 2026.
Compare the same data allowance and validity
The fixed-data table uses total allowances with 30-day validity. Every figure is a public price in EUR. A larger allowance does not reset each day, and the price alone says nothing about reception.
| Provider | 5 GB / 30 days | 10 GB / 30 days | 20 GB / 30 days |
|---|---|---|---|
| Horizon | €2.44 | €4.69 | €9.20 |
| Airalo | €8.00 | €11.00 | €17.50 |
| Nomad | €11.11 | €12.44 | €16.89 |
| Saily | €7.99 | €11.49 | €18.49 |
At 10 GB / 30 days, Horizon costs €4.69; Airalo lists €11.00, a difference of €6.31. Compare all the rows before choosing: these are dated quotes for the listed offers, not a ranking of every provider or every possible discount.
Nomad marks its 10 GB offer as a public sale. The table includes that displayed sale price; a coupon or membership is not assumed.
Separate the data budget from the calendar
Warsaw, Kraków and Gdańsk can share a Poland country plan wherever its supported networks are available. A trip with several train journeys may keep you away from accommodation Wi-Fi for longer. Save tickets and addresses offline so a poor connection does not prevent access to the essentials.
For an extended family visit, count the actual arrival and departure dates. A plan can still have data remaining when its validity ends. If you expect substantial laptop use, check that combined demand separately from the phone’s recent usage. The price table measures total data and validity; it does not establish reception on every train route.
Crossing into another covered country
Horizon’s Europe plan is €7.27 for 10 GB / 30 days, compared with €4.69 for Poland alone. The €2.58 premium adds the other listed destinations; Germany, Czech Republic and Slovakia are included at this check.
If your itinerary stays in Poland, that wider list may not justify the difference. If it includes neighbouring countries, compare the shared regional pool with separate country plans. Neither a train journey nor a land border renews the regional allowance. Check the whole route, including transit stops where you expect to use data.
Unlimited phone data and hotspot are different
Holafly publishes a 7-day unlimited plan at US$27.50 in its USD duration table. The same page specifies 1 GB per day for hotspot sharing. That can suit heavy use on the phone, but it is not unlimited laptop data. The allowance, duration and currency differ from the fixed EUR plans above, so no percentage saving is calculated against it.
Hotspot sharing is free on every Horizon plan.
A laptop or another device uses the purchased pool alongside the phone. Include photo backups, software updates and video meetings in your estimate. For an unlimited plan from another provider, read its current fair-use and hotspot terms before buying.
Horizon plans have no throttling.
Actual reception and speed still depend on the supported network, location, phone and congestion. This article does not contain route tests or speed measurements.
Check the phone before paying
Check device compatibility and that the phone is unlocked. Follow the installation guide over a stable internet connection before departure. Keep the eSIM installed while troubleshooting; deleting it is not a routine connection fix.
Validity does not start until your eSIM first connects to a supported mobile network at your destination.
Horizon’s listed plans are data-only. A data connection is different from a local phone number, ordinary calls or SMS. Your home carrier may still charge for calls, texts or data on its own line. Review both lines’ settings rather than assuming the travel plan changes your home contract.
Support, sources and the limits of this comparison
Horizon offers 24/7 human support in all languages, with guaranteed instant replies.
Contact Horizon support with setup or plan questions. An instant reply is not a promise of instant resolution. The refund policy explains purchase verification and how a refund is returned.
This comparison is written by Horizon; editorial owner: Lurian Kasumaj. Provider names link to the official product pages checked on 10 October 2026. EUR prices are the providers’ displayed euro prices, not our currency conversions. Holafly’s separate quote remains in USD. Public sale prices are included where labelled; subscriptions, account rewards and coupon codes are excluded. Recheck the selected plan and checkout before paying.
Short answers
Does 30-day validity mean I must stay for 30 days?
No. It is the expiry window after service begins, not a minimum stay. Compare the shorter plan’s actual price before assuming it costs less, and allow for your arrival and departure dates.
Is 10 GB a daily allowance?
No. In this comparison, 10 GB is the total pool for the plan. Sharing it with another device does not create a second allowance. Check your own recent mobile-data use and leave room for travel days.
