Ovaj tarifni paket ima neograničene mobilne podatke.

Ovaj means this, and it must agree with the noun it modifies.

Here, it goes with paket (package/plan), which is:

• masculine
• singular
• nominative (because it is the subject)

So the correct form is ovaj paket.

Compare:

• ovaj = masculine singular
• ova = feminine singular
• ovo = neuter singular

So ovaj tarifni paket = this tariff plan / this plan.

Tarifni paket is a very common telecom expression in Serbian. It literally means tariff package, but in natural English it usually corresponds to:

• plan
• phone plan
• mobile plan

Grammatically:

• tarifni = tariff / pricing-related
• paket = package / bundle / plan

So ovaj tarifni paket is a normal way to refer to a mobile service plan.

Yes. Ima is the 3rd person singular present of imati = to have.

Because the subject is singular:

• ovaj tarifni paket = singular
• the verb is ima = has

In Serbian, imati is often used where English might say:

• has
• includes
• comes with
• offers

So the sentence literally uses has, but in context it can feel like includes/offers.

Because podatke is the accusative plural, and the noun is the direct object of ima.

• podaci = nominative plural
• podatke = accusative plural

Since the plan has something, that thing is the direct object, so Serbian uses the accusative:

• ima podatke / has data

This is one of the most important patterns in Serbian:

• subject → usually nominative
• direct object → often accusative

So:

• Ovaj tarifni paket = subject
• ima neograničene mobilne podatke = verb + direct object

Because adjectives in Serbian must agree with the noun they describe in:

• gender
• number
• case

They describe podatke, so they take forms that match podatke.

Here the whole phrase is in the accusative plural:

• neograničene = unlimited
• mobilne = mobile
• podatke = data

So the endings match because they belong together as one noun phrase.

A useful way to think about it:

• dictionary/base forms: neograničen, mobilan, podatak
• sentence form: neograničene mobilne podatke

In this kind of telecom context, Serbian commonly uses mobilni podaci in the plural.

That can feel strange to an English speaker, because English usually treats data here like an uncountable mass noun:

• unlimited mobile data

But in Serbian, the standard phrase is often plural:

• mobilni podaci
• mobilne podatke in the accusative

So even though English says data without showing plural grammar in the same way, Serbian normally uses a plural noun here.

Not in this sentence.

Mobilnih podataka is genitive plural, but after ima as a normal direct object, Serbian uses the accusative, so:

• correct here: ima neograničene mobilne podatke

You would see mobilnih podataka in other structures, for example after certain prepositions or quantity expressions.

So the key point is:

• imati + direct object → usually accusative
• therefore: podatke, not podataka

Yes, Serbian word order is fairly flexible, but the given order is the most neutral and natural for this kind of statement.

Neutral order:

• Ovaj tarifni paket ima neograničene mobilne podatke.

You can move things around for emphasis, but it may sound more marked or stylistically different.

Inside the noun phrase, the normal order is:

• demonstrative + adjective + noun
• adjective + adjective + noun

So:

• ovaj tarifni paket
• neograničene mobilne podatke

That is the expected, standard order.

No. Serbian does not have articles like English a/an/the.

That means:

• paket can mean a package/plan or the package/plan, depending on context
• ovaj paket specifically means this package/plan

So ovaj is not an article. It is a demonstrative:

• ovaj = this

If you removed ovaj, the sentence would become more general:

• Tarifni paket ima neograničene mobilne podatke.

That could mean something like:

• The plan has unlimited mobile data
• A tariff plan has unlimited mobile data depending on context.

Here are the main dictionary forms:

• ovaj = this
• tarifni = tariff-related
• paket = package / plan
• imati = to have
• neograničen = unlimited
• mobilan or more commonly the adjective form mobilni in this expression = mobile
• podatak = piece of data / datum

In the sentence, several of these words change form to match grammar:

• ima from imati
• neograničene, mobilne, podatke because of agreement and case

A very useful pattern is:

Ovaj/taј + noun + ima + accusative object

For example:

• Ovaj paket ima 10 GB interneta.
• Ovaj plan ima besplatne poruke.
• Ova opcija ima neograničene pozive.

So the sentence gives you a good practical model:

• subject in nominative
• ima
• thing included/offered in the accusative