Slovakia 20GB 30 days
Orange / O2
- Data
- 20GB
- Validity
- 30 days
- Hotspot
- Yes
- Technology
- 3G / 4G / 5G
- 5G ready
- Hotspot
- Top-up ready
Validity starts on first connection at the destination
from$14.90$14.15
O2 Slovakia and travel eSIM in Slovakia
O2 Slovakia is one of the networks your eSIM may use in Slovakia. Here is who actually decides which network you get, and what to do with that.
Author: Porsch Kunnipat Siramanakul · Co-founderReviewed by: Bob Kanokphon ThongdeePublished: October 11, 2026Last updated: October 11, 2026
Quick answer
- 88 of the 88 Slovakia plans we sell name O2 Slovakia as a reachable network, at 4G and 5G.
- O2 runs LTE on B3, B20 and 5G on n78; your phone needs at least one of them.
- Travel plans connect by roaming, so no plan can promise one specific network.
O2 Slovakia in brief
O2 Slovakia is the former Telefónica O2 Slovakia, and its UMTS (3G) network was shut down in December 2025.
We are not a reseller for this operator and we have not run our own field speed tests. The band and network details below come from the sources listed at the end of the page.
O2's bands and technology
| Item | O2 |
|---|---|
| LTE (4G) | B3, B20 |
| 5G NR | n78 |
| 5G launched | 2021 |
| 3G | Shut down (2025) |
| Network code (MCC-MNC) | 231-06 |
Checked against the sources on 2026-10-11. Only the bands a source confirmed are listed; the network may run others too.
An eSIM can only use O2 if your phone supports at least one band in this table. Before you fly, open your model's spec page on the maker's site and compare its LTE and 5G band lists.
Who licenses O2
Mobile networks in Slovakia are licensed, and their spectrum assigned, by the Regulatory Authority for Electronic Communications and Postal Services (RÚ). The bands above are the ones it allocates. A problem with the local network's own service goes to the operator first; a problem with your eSIM plan comes to us.
The plans on our shelf that name O2 Slovakia
From the supplier record behind each package, 88 of the 88 plans we currently sell for Slovakia declare O2 Slovakia as a network the profile can reach, at 4G and 5G. The figure comes from the same catalogue that prices the plan pages, and it moves when the supplier revises the record.
A plan naming O2 Slovakia means the network sits in the list the profile may choose from. It does not mean your handset will stay on it. The priority order is the supplier's, and the signal where you stand decides.
O2 beside the other networks in Slovakia
| Network | LTE bands | 5G bands |
|---|---|---|
| O2 Slovakia | B3, B20 | n78 |
| Orange Slovensko | B3, B7, B20 | n78 |
| Telekom | B1, B3, B7, B20 | n1 |
A band shared across networks is one a single phone can use on all of them.
Why plans do not name a fixed network
Nearly every travel eSIM is a roaming product: the profile picks a network by an order the supplier sets, not by the buyer. If O2 Slovakia is weak where you are, try selecting 4ka or Orange Slovensko or Telekom manually in the network settings, and keep data roaming on for the eSIM profile.
FAQ
Will my eSIM definitely connect to O2 Slovakia?+
88 of our plans name O2 Slovakia as reachable, but that is not a guarantee. Travel plans run over roaming agreements, so the network depends on the supplier behind the plan, your device and where you are.
Which bands does my phone need for O2?+
At least one of these, LTE: B3, B20; 5G: n78. Your phone's band list is on the maker's spec page for your model, under "Cellular" or "Network".
Does O2 Slovakia run 5G, and will my plan get it?+
Yes. O2 has run commercial 5G since 2021, on n78. A travel plan only gets it when the plan permits 5G, your phone supports one of those bands, and you are inside 5G coverage. Miss any one and you fall back to 4G.
How do I see which network I am on?+
Check the carrier name at the top of the screen, or open the mobile-network settings and look at the operator list. If signal is poor, try selecting a network manually instead of automatic, but only one your plan actually supports.
Sources
- O2 Slovakia support: network and coverage (search result) — O2 Slovakia, October 11, 2026
- Wikipedia: Mobile network codes in ITU region 2xx (Europe) — Wikipedia, October 11, 2026
- Wikipedia: List of LTE networks in Europe — Wikipedia, October 11, 2026
- Wikipedia: List of 5G NR networks — Wikipedia, October 11, 2026
- Regulatory Authority homepage — Úrad pre reguláciu elektronických komunikácií a poštových služieb, October 11, 2026
About the author
Porsch Kunnipat Siramanakul
- Co-founder of eSIMonline.asia
- Digital marketer
- Performance marketing and marketing planning
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