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A1 Slovenija and travel eSIM in Slovenia

A1 Slovenija is one of the networks your eSIM may use in Slovenia. Here is who actually decides which network you get, and what to do with that.

Author: Bob Kanokphon Thongdee · Co-founderReviewed by: Porsch Kunnipat SiramanakulPublished: October 11, 2026Last updated: October 11, 2026
A1 Slovenija and travel eSIM in Slovenia

Quick answer

  • 70 of the 98 Slovenia plans we sell name A1 Slovenija as a reachable network, at 4G and 5G.
  • A1 Slovenija runs LTE on B1, B3, B7, B20 and 5G on n28, n78; your phone needs at least one of them.
  • Travel plans connect by roaming, so no plan can promise one specific network.

A1 Slovenija in brief

A1 Slovenija is the former Si.mobil; its site says its 5G network reaches 88 percent of residents, and its UMTS (3G) network was shut down in June 2023.

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.
A1 Slovenija and travel eSIM in Slovenia

A1 Slovenija's bands and technology

ItemA1 Slovenija
LTE (4G)B1, B3, B7, B20
5G NRn28, n78
5G launched2021
3GShut down (2023)
Network code (MCC-MNC)293-40

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 A1 Slovenija 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.

A1 Slovenija's coverage map

A1 Slovenija publishes its own coverage map. Look up the street or district you will stay in rather than the country as a whole, because coverage in town and out of town differs a great deal. The map shows A1 Slovenija's own network; a roaming plan may not get every technology it shows.

Who licenses A1 Slovenija

Mobile networks in Slovenia are licensed, and their spectrum assigned, by the Agency for Communication Networks and Services of the Republic of Slovenia (AKOS). 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.

A1 Slovenija and travel eSIM in Slovenia

The plans on our shelf that name A1 Slovenija

From the supplier record behind each package, 70 of the 98 plans we currently sell for Slovenia declare A1 Slovenija 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 A1 Slovenija 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.

A1 Slovenija beside the other networks in Slovenia

NetworkLTE bands5G bands
A1 SlovenijaB1, B3, B7, B20n28, n78
Telemach SlovenijaB3, B20n28, n78

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 A1 Slovenija is weak where you are, try selecting Telekom Slovenije or Telemach Slovenija manually in the network settings, and keep data roaming on for the eSIM profile.

FAQ

Will my eSIM definitely connect to A1 Slovenija?+

70 of our plans name A1 Slovenija 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 A1 Slovenija?+

At least one of these, LTE: B1, B3, B7, B20; 5G: n28, n78. Your phone's band list is on the maker's spec page for your model, under "Cellular" or "Network".

Does A1 Slovenija run 5G, and will my plan get it?+

Yes. A1 Slovenija has run commercial 5G since 2021, on n28, 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

About the author

Bob Kanokphon Thongdee

Bob Kanokphon Thongdee

  • Co-founder of eSIMonline.asia
  • More than 7 years in online marketing
  • Founder of Cojourney Visa and Cojourney Travel
Meet the foundersLinkedIn
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Telekom SlovenijeTelemach Slovenija