Pokud jde o datový limit, potřebuji neomezená mobilní data.

Here, Pokud jde o is best understood as a fixed expression meaning as for, when it comes to, or regarding.

So in this sentence, Pokud jde o datový limit means something like:

• As for the data limit
• When it comes to the data limit

Even though pokud often means if in other sentences, you should not translate this phrase word for word. It is much more natural to learn Pokud jde o as one chunk.

Because the verb phrase is jít o, which means to be about, to concern, or to involve.

So:

• jde o cenu = it is about the price
• jde o čas = it is about time
• jde o datový limit = it concerns the data limit

In this expression, o is required. It is not optional.

It is in the accusative, because jít o takes the accusative.

So grammatically, this is:

• o + accusative

However, limit is a masculine inanimate noun, and in the singular its accusative form is the same as its nominative form. That is why datový limit looks unchanged.

So although the form looks like the dictionary form, it is functioning as accusative here.

Datový limit is the normal Czech way to say data limit or data cap in this context.

The adjective datový means data-related. So:

• datový limit = data limit / data cap

You might sometimes see other structures in Czech, but in telecom or phone-plan language, datový limit is the standard, natural phrase.

So this is not just grammar; it is also the normal collocation.

Potřebuji is the 1st person singular present form of potřebovat, meaning to need.

So:

• potřebuji = I need

It matches the speaker:

• já potřebuji = I need

In Czech, the subject pronoun já is usually omitted because the verb ending already shows who the subject is.

Yes. Both are common.

• potřebuji = more standard or neutral
• potřebuju = very common in everyday spoken Czech

Both mean I need. In careful writing or textbook Czech, you will often see potřebuji. In conversation, potřebuju is extremely common.

In Czech, data is normally treated as a plural noun, especially in the meaning of digital or mobile data.

So:

• mobilní data = mobile data

This is different from English, where data can behave more like a mass noun.

In Czech telecom usage, data is the normal word, and it takes plural agreement. The singular datum does exist, but it usually means date or a technical datum, not mobile data in this kind of sentence.

They agree with data.

Since data is:

• plural
• neuter
• here functioning as the accusative object

the adjectives must match it.

So:

• neomezená = neuter plural accusative/nominative form of neomezený
• mobilní = matching plural form of mobilní

The whole phrase neomezená mobilní data is the direct object of potřebuji.

A useful point: for neuter plural, the nominative and accusative forms are the same, so the phrase looks the same in both cases.

Because Pokud jde o datový limit is an introductory topic phrase, and it is separated from the main clause by a comma.

This works a lot like English:

• As for the data limit, I need unlimited mobile data.

So the comma helps show that the sentence begins with the topic, and then moves to the main statement.

Yes, Czech word order is flexible, but the original order is natural because it sets the topic first.

• Pokud jde o datový limit, potřebuji neomezená mobilní data.

This structure means something like:

• As for the data limit, ...

It sounds natural because it first introduces the category being discussed, then gives the speaker’s requirement.

You could move things around, but not every version sounds equally natural. The original sentence is a good, clear choice.

Yes. Common alternatives include:

• Co se týče datového limitu, ... = as far as the data limit is concerned...
• Ohledně datového limitu, ... = regarding the data limit...

Notice that these alternatives may require a different case:

• Pokud jde o datový limit → accusative
• Co se týče datového limitu → genitive
• Ohledně datového limitu → genitive

So the meaning is similar, but the grammar changes.

Roughly, it is po-tře-bu-ji.

A few pronunciation notes:

• ř is a special Czech sound with no exact English equivalent.
• j is pronounced like English y.
• So -ji sounds like yee, not like English jai.

If ř is difficult, that is completely normal for learners. At first, an approximate pronunciation is fine, as long as you keep the syllables clear:

• po-tře-bu-ji

A careful learner pronunciation is much better than trying to force a perfect ř too early.