Ne želim postpejd paket bez neograničenih mobilnih podataka.

Serbian usually forms sentence negation by putting ne in front of the verb.

• želim = I want
• ne želim = I do not want / I don’t want

In this sentence, ne is written separately from želim. That is the normal pattern with most present-tense verbs.

Želim is the 1st person singular present tense of the verb želeti (also seen as željeti in some varieties).

So:

• ja želim = I want
• ja ne želim = I do not want

The subject ja is not stated because Serbian often leaves subject pronouns out when the verb ending already makes the subject clear.

Because paket is the direct object of želim, so it is in the accusative case.

However, paket is a masculine inanimate noun, and for many masculine inanimate nouns, the accusative singular looks the same as the nominative singular.

So:

• nominative: paket
• accusative: paket

That is why the form does not visibly change.

Postpejd is a borrowed telecom word, based on English postpaid. In Serbian, it is commonly used to describe a phone plan or package paid after usage.

In postpejd paket, it functions like a modifier of paket, similar to an adjective in meaning:

• postpejd paket = a postpaid package/plan

You may also see spelling influenced by English in ads or branding, but postpejd is a very common Serbian-style spelling.

Because bez means without, and the preposition bez always takes the genitive case.

So after bez, the noun phrase must go into genitive:

• basic phrase: neograničeni mobilni podaci
• after bez: bez neograničenih mobilnih podataka

This is one of the most important preposition-case patterns to learn:

• bez + genitive

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

• gender
• number
• case

Here the noun is podataka, which is genitive plural, so both adjectives must also be genitive plural:

• neograničeni mobilni podaci = nominative plural
• bez neograničenih mobilnih podataka = genitive plural

That is why both adjectives take the ending -ih.

In Serbian, podaci is normally treated as a plural noun in everyday usage, especially in tech and telecom language.

So:

• singular: podatak = a piece of data / a datum
• plural: podaci = data

And after bez, you need the genitive plural:

• podaci → podataka

So mobilni podaci is the normal Serbian way to say mobile data.

Yes, it is very natural, especially in telecom and marketing language.

It literally corresponds to unlimited mobile data, but grammatically it appears in genitive plural because of bez.

A learner should recognize that the dictionary-like base form would be:

• neograničeni mobilni podaci

But inside this sentence it becomes:

• bez neograničenih mobilnih podataka

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

For example, these are possible:

• Ne želim postpejd paket bez neograničenih mobilnih podataka.
• Ne želim paket bez neograničenih mobilnih podataka.
• Postpejd paket bez neograničenih mobilnih podataka ne želim.
  This version sounds more marked and puts stronger emphasis on that whole package.

The given sentence is natural and straightforward. Keeping postpejd paket together is especially normal, because those two words form a clear unit.

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

So paket can mean:

• a package
• the package

Which meaning is intended depends on context. In this sentence, English may translate it with a or just leave it general, but Serbian does not need a separate article word.

No. This is not a double negative.

• ne is the actual grammatical negation of the verb: ne želim = I do not want
• bez is just the preposition without

So the sentence has one negated verb plus a prepositional phrase. That is completely normal.

A rough English-friendly guide is:

• postpejd ≈ POST-payd
• želim ≈ ZHEH-leem

A few notes:

• ž sounds like the s in measure
• j in Serbian sounds like English y
• Serbian pronunciation is usually quite phonetic, so words are generally pronounced close to how they are written

So Ne želim postpejd paket would sound roughly like:

neh ZHEH-leem POST-payd PAH-ket