Jag jämför hastigheten och täckningen innan jag väljer.

Because they are in the definite singular form: the speed and the coverage.

In Swedish, the definite article is usually attached to the end of the noun instead of being a separate word like the in English.

• hastighet = speed
• hastigheten = the speed
• täckning = coverage
• täckningen = the coverage

So Jag jämför hastigheten och täckningen means I compare the speed and the coverage.

Swedish usually uses the suffix definite article by itself when there is no adjective.

So you normally say:

• hastigheten = the speed
• täckningen = the coverage

You would use den as well if there were an adjective:

• den höga hastigheten = the high speed
• den dåliga täckningen = the bad coverage

Without an adjective, den is usually not needed.

Because innan jag väljer is a full clause: before I choose.

In Swedish, just like in English, a clause usually needs its own subject and verb. So:

• innan jag väljer = before I choose

You cannot normally leave out jag here.

Väljer is the present tense form of välja.

• välja = to choose
• väljer = choose / am choosing

In this sentence, Swedish uses the present tense just like English often does in clauses like before I choose.

So:

• innan jag väljer = before I choose

Not:

• innan jag välja ❌

Because innan is a conjunction introducing a subordinate clause, not an infinitive construction.

Compare:

• Jag vill välja. = I want to choose.
  
  • Here välja is an infinitive, so you may see att in some structures.
• innan jag väljer = before I choose
  
  • Here väljer is a finite verb in a clause with its own subject, so no att is used.

So innan jag väljer is correct.

Both can relate to before, but they are used differently.

• innan is usually a conjunction and introduces a clause:
  • innan jag väljer = before I choose
• före is usually a preposition and is followed by a noun or pronoun:
  • före valet = before the choice
  • före lunch = before lunch

So in this sentence, innan is the natural choice because it is followed by the clause jag väljer.

Because innan starts a subordinate clause, and in Swedish subordinate clauses, the subject normally comes before the verb.

So:

• innan jag väljer = correct
• innan väljer jag = incorrect

This is one of the key word-order patterns in Swedish:

• Main clause: often verb in second position
• Subordinate clause: subject usually comes before the verb

Yes. If the subordinate clause comes first, the main clause uses inversion.

So:

• Jag jämför hastigheten och täckningen innan jag väljer.
• Innan jag väljer, jämför jag hastigheten och täckningen.

Notice the second version has:

• jämför jag
  not
• jag jämför

That is normal Swedish main-clause word order after an introductory element.

Not in this sentence.

Swedish can use jämföra in different ways:

• jämföra A och B = compare A and B
• jämföra A med B = compare A with B

In your sentence, the idea is that the speaker is looking at two things side by side, so jämför hastigheten och täckningen works well.

If you wanted to be more explicit, you could sometimes rephrase the sentence, but as written it is completely natural.

Because Swedish often uses the present tense for actions in the near future or in general procedures, especially when the timing is clear from the context.

So:

• Jag jämför ... innan jag väljer.
  = I compare ... before I choose.

This can mean:

• a general habit
• a usual process
• something the speaker is about to do

Swedish does not always need a special future form.

Yes. Their base forms are:

• en hastighet
• en täckning

That is why the definite singular forms are:

• hastigheten
• täckningen

A useful pattern is that many nouns ending in -het and -ning are en-words.

A few pronunciation points may help:

• ä sounds somewhat like the vowel in English bed, though not exactly the same.
• ö has no exact English equivalent; it is a rounded front vowel.
• j in Swedish sounds like English y in yes.

So roughly:

• jämför ≈ YEM-fur (very approximate)
• väljer ≈ VEL-yer (also approximate)

A few details:

• The j in both words is a y sound.
• The r in väljer may be weak depending on accent.
• The vowels are important, so it is worth listening to native audio if possible.

Very likely, yes, because hastigheten and täckningen together often suggest things like:

• mobile networks
• internet providers
• phone plans

Especially täckning often means coverage in the sense of signal coverage or network coverage.

But grammatically, the sentence itself just says the speaker compares the speed and the coverage before choosing.