Trots den höga månadsavgiften är mobilabonnemanget prisvärt.

Trots is a preposition meaning despite or in spite of.

In this sentence, it is followed by a noun phrase:

trots den höga månadsavgiften = despite the high monthly fee

If you want to follow it with a whole clause, Swedish normally uses trots att:

• Trots att månadsavgiften är hög, är mobilabonnemanget prisvärt.

So:

• trots + noun phrase
• trots att + clause

This is because Swedish follows the V2 rule in main clauses: the finite verb must come in the second position.

Here, the first element is the fronted phrase:

Trots den höga månadsavgiften

So the verb must come next:

är

And then the subject follows:

mobilabonnemanget

Structure:

• Trots den höga månadsavgiften = first element
• är = second-position verb
• mobilabonnemanget = subject

This is very normal Swedish word order.

Compare:

• Mobilabonnemanget är prisvärt.
• Trots den höga månadsavgiften är mobilabonnemanget prisvärt.

Both are correct.

This is a classic Swedish pattern called double definiteness.

When a noun is definite and has an adjective before it, Swedish usually uses:

• den/det/de
• adjective in the definite form
• noun with a definite ending

So:

• den = definite article
• höga = definite form of the adjective
• månadsavgiften = the noun with definite ending

That gives:

den höga månadsavgiften = the high monthly fee

Compare:

• en hög månadsavgift = a high monthly fee
• den höga månadsavgiften = the high monthly fee

So both the article and the noun show definiteness.

Because it is inside a definite noun phrase: den höga månadsavgiften.

In Swedish, adjectives often change form depending on gender, number, and definiteness.

For hög:

• en hög avgift = a high fee
• ett högt pris = a high price
• den höga avgiften = the high fee
• de höga avgifterna = the high fees

So höga is the form used in definite phrases, and also in plural.

Swedish makes heavy use of compound nouns, much more than English does.

Here:

• månad = month
• avgift = fee

Together they form:

• månadsavgift = monthly fee

The -s- is a linking s, which is common in Swedish compounds. It does not have a separate meaning here; it just helps form the compound.

Then the definite ending -en is added:

• månadsavgift = monthly fee
• månadsavgiften = the monthly fee

So the full form is built like this:

månad + s + avgift + en

Because abonnemang is an ett-word in Swedish:

• ett abonnemang = a subscription
• abonnemanget = the subscription

The full compound is:

• mobilabonnemang = mobile subscription / mobile plan
• mobilabonnemanget = the mobile subscription / the mobile plan

In Swedish compounds, the last part usually determines the grammatical gender. Since abonnemang is neuter (ett), the whole compound is also neuter.

So:

• ett mobilabonnemang
• mobilabonnemanget

Because prisvärt is agreeing with mobilabonnemanget, which is an ett-word.

The adjective prisvärd changes form:

• en prisvärd tjänst = a good-value service
• ett prisvärt abonnemang = a good-value subscription
• prisvärda tjänster/abonnemang = good-value services/subscriptions

Here, the subject is:

mobilabonnemanget

Since that is neuter singular, the predicate adjective becomes:

prisvärt

This kind of agreement also happens after är.

Not exactly.

Prisvärd usually means good value for money, not simply low-priced.

So something can be:

• expensive but still prisvärt if what you get is worth the cost
• cheap but not prisvärt if the quality is poor

That is why this sentence makes sense:

Trots den höga månadsavgiften är mobilabonnemanget prisvärt.

Even though the monthly fee is high, the plan is still worth the price.

Yes, but the structure changes.

Trots is followed by a noun phrase:

• Trots den höga månadsavgiften ...

But fastän and även om introduce clauses:

• Fastän månadsavgiften är hög, är mobilabonnemanget prisvärt.
• Även om månadsavgiften är hög, är mobilabonnemanget prisvärt.

So the meaning is similar, but the grammar is different:

• trots + noun phrase
• fastän / även om + clause

Yes, a few things:

1. V2 word order
   After a fronted phrase like Trots den höga månadsavgiften, the verb still comes second.

2. Double definiteness
   Swedish often uses both a separate definite article and a definite noun ending: den höga månadsavgiften

3. Compound nouns
   Swedish prefers long compound words such as: månadsavgift and mobilabonnemang

4. Adjective agreement
   The adjective prisvärt changes form to match the gender of mobilabonnemanget

So this sentence is a very good example of several important Swedish grammar patterns at once.