Mobilabonnementet er pengene værd.

It means the mobile phone plan or the mobile subscription.

In Danish, abonnement is a very common word for a subscription or service plan, and mobilabonnement specifically means a mobile phone plan.

Because Danish, like German, often makes compound nouns by joining words together.

Here, you have:

• mobil = mobile / mobile phone
• abonnement = subscription / plan

So:

• mobilabonnement = mobile subscription / mobile plan

Then Danish adds the definite ending to the whole compound:

• mobilabonnementet = the mobile plan

The ending -et is the definite article attached to the noun. In English, you usually put the before the noun. In Danish, the the is often added to the end instead.

For example:

• et abonnement = a subscription
• abonnementet = the subscription

Since mobilabonnement is a neuter noun, its definite ending is -et:

• et mobilabonnement = a mobile plan
• mobilabonnementet = the mobile plan

Because Danish usually expresses definiteness by adding a suffix to the noun instead of using a separate word.

So English:

• the mobile plan

Danish:

• mobilabonnementet

This is completely normal Danish grammar. A separate definite word such as det is not used here.

Er means is.

It is the present tense of at være, which means to be.

So the basic structure is:

• Mobilabonnementet = the mobile plan
• er = is
• pengene værd = worth the money

Penge means money, but grammatically it behaves like a plural noun in Danish. The form pengene means the money.

So:

• penge = money
• pengene = the money

In this expression, Danish normally uses pengene værd, which matches English worth the money.

Here, værd means worth.

It is used in expressions about whether something deserves the cost, time, effort, and so on.

Common examples:

• Det er det værd = It is worth it
• Det er pengene værd = It is worth the money
• Det er tiden værd = It is worth the time

So in your sentence, værd does not mean value as a noun. It means worth in the sense of being worth something.

Because pengene værd is the normal Danish pattern.

Danish usually puts the thing being measured first, and værd after it:

• pengene værd = worth the money
• tiden værd = worth the time
• besværet værd = worth the trouble

So er pengene værd is the idiomatic way to say it.

Yes, it is a very common expression in everyday Danish.

You will often hear things like:

• Filmen er pengene værd = The film is worth the money
• Restauranten er ikke pengene værd = The restaurant is not worth the money
• Kurset var alle pengene værd = The course was worth every penny

So this sentence uses a very natural, common Danish pattern.

It refers to a specific mobile plan.

That is because mobilabonnementet is definite: the mobile plan.

If you wanted to speak more generally, you might use:

• Et mobilabonnement er pengene værd = A mobile plan is worth the money

But your original sentence points to one particular plan that is already known from the context.

To make it negative, add ikke:

• Mobilabonnementet er ikke pengene værd = The mobile plan is not worth the money

To make it a yes/no question, move er before the subject:

• Er mobilabonnementet pengene værd? = Is the mobile plan worth the money?

That is a standard Danish word order change for questions.