Vi ska teckna ett nytt mobilabonnemang.

A very literal breakdown is:

• Vi = we
• ska = will / are going to / shall
• teckna = sign up for / take out / enter into
• ett = a / an for an ett-word
• nytt = new in the form that matches an ett-word
• mobilabonnemang = mobile phone plan / cell phone subscription

So the full sentence means something like:

We’re going to sign up for a new mobile phone plan.

Ska is very common in Swedish and often expresses:

• a future action: will
• a plan or intention: going to
• sometimes obligation, depending on context: shall / must

In this sentence, ska most naturally means are going to or will:

• Vi ska teckna ett nytt mobilabonnemang
  = We’re going to sign up for a new mobile plan

So it is not just a plain present tense. It suggests a planned future action.

Because after the modal verb ska, Swedish normally uses the infinitive without att.

So:

• Vi ska teckna = We are going to sign up
• not Vi ska att teckna

This is similar to English in a way:

• We will sign
• not We will to sign

Other modal verbs work the same way in Swedish:

• kan teckna = can sign up
• vill teckna = want to sign up
• måste teckna = must sign up

Yes, teckna can mean draw in some contexts, but it also has another important meaning: to sign, to subscribe to, or to take out an agreement.

That is the meaning here.

With contracts, insurance, subscriptions, and similar things, teckna is very common:

• teckna ett avtal = enter into/sign an agreement
• teckna en försäkring = take out insurance
• teckna ett abonnemang = sign up for a subscription/plan

So in this sentence, teckna does not mean draw.

The correct form in the sentence is mobilabonnemang as one compound word, and it means a mobile phone subscription or cell phone plan.

It is made up of:

• mobil = mobile phone
• abonnemang = subscription / service plan

Swedish very often combines nouns into one long compound word, where English would often use several words.

So:

• mobilabonnemang = literally something like mobile-subscription
• natural English: mobile plan, phone plan, or mobile subscription

Because abonnemang is an ett-word in Swedish, not an en-word.

That means you need:

• ett abonnemang = a subscription/plan

And the adjective must match that gender:

• en ny bil = a new car
• ett nytt abonnemang = a new subscription

So:

• ett is the correct article
• nytt is the correct adjective form for an ett-word

This is adjective agreement.

The basic adjective is ny = new, but its form changes depending on the noun.

For singular indefinite nouns:

• en-word: ny
  • en ny telefon
• ett-word: nytt
  • ett nytt abonnemang

For plural or definite forms, you often get nya:

• nya telefoner
• det nya abonnemanget

So in ett nytt mobilabonnemang, nytt is used because mobilabonnemang is an ett-word.

The structure is:

subject + modal verb + infinitive + object

So here:

• Vi = subject
• ska = modal verb
• teckna = infinitive main verb
• ett nytt mobilabonnemang = object

This is a very common Swedish sentence pattern.

Another example:

• Jag ska köpa en bil = I’m going to buy a car

Not usually in the same way.

• skriva under means sign in the physical sense of writing your signature on a document
• teckna often means take out, enter into, or sign up for an agreement or subscription

So:

• teckna ett mobilabonnemang = idiomatic, natural
• skriva under ett mobilabonnemang = not the normal way to say it

If you want to emphasize the physical act of signing the contract, you might talk about signing the agreement/document, for example:

• skriva under avtalet = sign the agreement

But for the whole idea of getting the plan, teckna is the better verb.

It can suggest both, depending on context.

Ska often implies that the speakers have a plan or intention. So this sentence can mean:

• they have decided to do it
• they are going to do it soon
• it is the next step they intend to take

So Vi ska teckna ett nytt mobilabonnemang often sounds a bit more planned than just a neutral future statement.

A learner usually finds this word long because it is a compound.

A helpful way to see it is in parts:

• mobil
• abonnemang

Try not to separate them too much in actual speech, because Swedish treats it as one word.

A rough English-friendly guide might be:

mo-beel ah-bo-neh-MANG

The final part -mang gets clear stress. Exact pronunciation varies a little by accent, but the important thing is to recognize it as one compound noun.

Yes, in some contexts that is a reasonable translation.

Possible English translations include:

• We’re going to sign up for a new mobile plan
• We’re going to get a new cell phone subscription
• We will take out a new mobile subscription
• We will sign a new cell phone contract

The best translation depends on context. If the focus is on the service plan itself, mobile plan/subscription is often best. If the focus is more on the legal agreement, contract can also work.