Before you start

Passport for a prepaid SIM
Tax number and residence documentation for postpaid
A Slovenian bank account for direct debit on most contracts
Landlord permission for any installation

Step-by-step

1
Buy a prepaid SIM on arrival
All the operators sell prepaid packs in shops and at the airport, registered against a passport. This covers the weeks before the tax number and bank account exist.
In personWho: YouDay 1
2
Move to postpaid once the tax number exists
Postpaid plans want the tax number, residence documentation and usually a Slovenian bank account for direct debit. They are cheaper per gigabyte and commonly bundle home internet and television.
In personWho: You
3
Check what is installed in the building
Slovenian buildings are served by whichever operators have equipment there. Ljubljana's newer districts are well fibred; some older central buildings are more limited. Ask the landlord which operators the previous tenant could actually use.
In personWho: You
4
Take the bundle rather than standalone products
Slovenian operators price combined mobile, broadband and television packages well below the sum of the parts. Ask explicitly for the bundle price.
In personWho: You
5
Use EU roaming freely across four borders
Slovenian plans include EU roaming, and Slovenia borders Austria, Italy, Hungary and Croatia — all EU. Bosnia is the nearest non-EU destination and behaves differently. This is one of the few places where EU roaming is genuinely a weekly rather than an annual benefit.
Mobile appWho: You
6
Port your number when switching
Slovenia operates number portability. Never cancel the old contract before the port completes.
In personWho: You

Documents you’ll need

Passport for prepaid registration
Tax number and residence documentation for postpaid
Slovenian bank details for direct debit
Landlord permission for installation

Things most newcomers don’t know

A two-million-person market means fewer operators and less price competition than next door.

Slovenia's telecoms prices sit noticeably above Romania's, Bulgaria's or Serbia's — not because the infrastructure is worse but because there is less room for the aggressive price competition that a larger market supports. Newcomers arriving from Bucharest or Sofia should expect to pay more for the same allowance. What you get in return is good coverage across difficult Alpine and Karst terrain and customer service that will speak English without a fuss.

Source: AKOS

Slovenia's four EU land borders make EU roaming a weekly benefit rather than a holiday one.

Austria, Italy, Hungary and Croatia are all EU members and all reachable within about two hours from Ljubljana. Trieste is closer than several Slovenian towns. That means a Slovenian plan works domestically across an area most people would treat as four countries, and EU roaming stops being a holiday consideration and becomes part of ordinary life. Bosnia and Herzegovina and Serbia are the exceptions and are charged separately.

Source: AKOS

The city is small enough that fibre coverage is genuinely good almost everywhere.

Ljubljana has under 300,000 residents in a compact municipality, and both the incumbent and the cable operator have wired it thoroughly. Unlike Zagreb, Sofia or Budapest, there is no sharp divide between well-connected outer estates and poorly connected historic blocks. It is one of the few practical advantages of a very small capital.

Source: community-reported

Prepaid SIMs are registered, so the anonymous option does not exist.

Slovenian operators register prepaid SIMs against identity documents. A passport suffices on arrival, so this is no obstacle, but the anonymous prepaid SIM described in older guides is gone. A lost SIM can be blocked and the number recovered, which is the compensation.

Source: AKOS