Mobilni operater ima novi tarifni paket.

Mobilni operater is in the nominative singular because it is the subject of the sentence.

Novi tarifni paket is in the accusative singular because it is the direct object after ima.

A useful detail: in Serbian, masculine inanimate nouns often look the same in the nominative and accusative singular, so paket does not visibly change here.

Serbian does not have articles like English a/an and the.

So Serbian simply says:

• mobilni operater = a mobile operator or the mobile operator
• novi tarifni paket = a new tariff package/plan or the new tariff package/plan

Context tells you which meaning is intended.

Ima is the 3rd person singular present tense of the verb imati, which means to have.

So:

• ja imam = I have
• ti imaš = you have
• on/ona/ono ima = he/she/it has

Here, mobilni operater is singular, so ima is the correct form.

Because they are adjectives agreeing with masculine singular nouns.

In Serbian, adjectives must agree with the noun they describe in:

• gender
• number
• case

So:

• mobilni operater: mobilni agrees with operater
• novi tarifni paket: both novi and tarifni agree with paket

Here the nouns are masculine singular, and the adjective forms match that.

Because paket is a masculine inanimate noun.

In Serbian, the accusative singular of masculine inanimate nouns is usually identical to the nominative singular.

So:

• nominative: paket
• accusative: paket

That is why the object looks unchanged.

Because tarifni paket functions as a fairly fixed phrase meaning something like tariff plan, pricing plan, or service plan.

Then novi is added in front to describe that whole phrase:

• tarifni paket = tariff/rate plan
• novi tarifni paket = new tariff/rate plan

So the order sounds natural because tarifni paket is the core unit, and novi modifies it.

This is a very common learner question.

Serbian masculine singular adjectives can have a short form and a long form:

• nov
• novi

In modern standard Serbian, the long form such as novi is very common before a noun and sounds completely natural here.

The short/long distinction does not match English a/the in any simple one-to-one way, so it is best to learn novi tarifni paket as a normal, standard phrase.

Yes, Serbian word order is more flexible than English word order.

However, Mobilni operater ima novi tarifni paket is the most neutral and straightforward order:

• subject: Mobilni operater
• verb: ima
• object: novi tarifni paket

Other orders are possible for emphasis, but they are not the plain default.

Yes. Literally, tarifni paket is tariff package.

But in real usage, it usually means something more natural in English, such as:

• plan
• pricing plan
• rate plan
• mobile plan

So even if the words are literal, the expression itself is standard Serbian telecom vocabulary.

Yes. Serbian uses both Latin and Cyrillic scripts.

The Cyrillic version is:

Мобилни оператер има нови тарифни пакет.

The meaning and grammar stay exactly the same; only the script changes.