Roamingen virker kun hvis telefonen bruger SIM-kortet eller eSIM-kortet.

Because Danish often adds the definite article to the end of the noun.

• roaming = roaming
• roamingen = the roaming

So Roamingen virker ... literally means The roaming works ..., but in natural English you would usually just say Roaming works ... or Roaming only works ....

This is very common in Danish:

• telefon → telefonen = the phone
• bil → bilen = the car

Here, roaming is a loanword from English, but it still follows Danish grammar.

Virker is the present tense of virke, and here it means works or functions.

So:

• Roamingen virker = Roaming works / The roaming functions

In tech contexts, virker is extremely common for works:

• Det virker ikke = It doesn’t work
• Appen virker fint = The app works fine

Yes. kun hvis means only if.

So:

• Roamingen virker kun hvis ... = Roaming only works if ...

Breaking it down:

• kun = only
• hvis = if

This is a very useful phrase in Danish.

Here, hvis is the correct word because it introduces a condition.

• hvis = if, in the sense of on the condition that
• om can sometimes mean whether or if, but not usually in this kind of conditional sentence

So:

• Det virker, hvis du prøver igen = It works if you try again

But:

• Jeg ved ikke, om det virker = I don’t know whether it works

In your sentence, the meaning is conditional, so hvis is the right choice.

Telefonen means the phone.

Danish usually attaches the definite article to the noun:

• telefon = phone
• telefonen = the phone

In this sentence, we are talking about a specific phone involved in the situation, so the definite form is natural.

Bruger is the present tense of bruge, which means to use.

So:

• telefonen bruger SIM-kortet = the phone uses the SIM card

A few examples:

• Jeg bruger min computer = I use my computer
• Hun bruger Wi‑Fi = She uses Wi‑Fi

That -et is the definite article for a neuter noun.

• et SIM-kort = a SIM card
• SIM-kortet = the SIM card
• et eSIM-kort = an eSIM card
• eSIM-kortet = the eSIM card

So both nouns are in the definite form.

This happens because kort is a neuter noun:

• et kort
• kortet

Since SIM-kort and eSIM-kort are compounds ending in kort, they follow the same pattern.

That is just a normal feature of Danish grammar. Unlike English, Danish often uses a suffixed definite article.

Compare:

• English: the phone
• Danish: telefonen

Some common patterns:

• en bil → bilen
• et hus → huset
• en computer → computeren

So in this sentence:

• telefonen = the phone
• SIM-kortet = the SIM card

Because after hvis, Danish uses normal subordinate clause word order.

In the clause:

• hvis telefonen bruger SIM-kortet eller eSIM-kortet

the subject comes before the verb:

• telefonen = subject
• bruger = verb

This is normal after conjunctions like hvis, fordi, når, and at.

Compare:

• Telefonen bruger eSIM-kortet = main clause
• hvis telefonen bruger eSIM-kortet = subordinate clause

So this word order is exactly what you should expect.

Yes. Eller means or.

So:

• SIM-kortet eller eSIM-kortet = the SIM card or the eSIM card

It connects two alternatives, just like English or.

In Danish, hyphens are often used in compounds when one part is an abbreviation, acronym, letter, or foreign-looking element.

So:

• SIM-kort
• eSIM-kort

The hyphen makes the word easier to read.

Danish loves compound nouns, and many are written as one word, but hyphens are common in technical terms like this.

It is understandable and grammatically fine, especially in technical or explanatory language.

However, in real-life usage, people might also simply say eSIM instead of eSIM-kort because an eSIM is not a physical card in the same way a SIM card is.

So you may see:

• telefonen bruger eSIM
• telefonen bruger SIM-kortet eller eSIM

But the version in your sentence is still useful because it keeps the structure parallel:

• SIM-kortet eller eSIM-kortet

That can make the sentence clearer for learners and in support/documentation contexts.

Yes. It is an English loanword used in Danish, especially in mobile and tech contexts.

Even though it comes from English, Danish treats it like a normal Danish noun:

• roaming
• roamingen

This is very common with modern technical vocabulary. Danish often borrows the word but still applies Danish grammar to it.

It is fairly close to English.

A very literal breakdown would be:

• Roamingen = the roaming
• virker = works
• kun hvis = only if
• telefonen = the phone
• bruger = uses
• SIM-kortet eller eSIM-kortet = the SIM card or the eSIM card

So the overall structure is quite learner-friendly because it matches English closely:

• Roaming only works if the phone uses the SIM card or the eSIM card.

The main differences are:

1. Danish puts the at the end of nouns
2. Danish uses kun hvis for only if
3. Danish keeps normal subordinate clause order after hvis