Пакет послуг включає мобільний інтернет.

Because пакет послуг means a package of services, and after пакет Ukrainian normally uses the genitive case: пакет чого? = a package of what?

So:

• послуга = service
• послуги = services
• послуг = of services

This is very similar to English package of services, where English uses of and Ukrainian uses the genitive case instead.

Включає is the 3rd person singular present tense form of the verb включати.

So:

• включати = to include
• включає = includes

It matches the subject пакет:

• пакет = package
• пакет включає = the package includes

The subject is singular, so the verb is singular too.

It actually is the direct object, so it is in the accusative case. But for inanimate masculine nouns in Ukrainian, the accusative is often the same as the nominative.

That is why you see:

• мобільний інтернет = nominative
• мобільний інтернет = accusative as well

So even though it is the object of включає, its form looks unchanged.

Because the adjective must agree with the noun it describes.

Here the noun is інтернет, which is:

• masculine
• singular

So the adjective must also be masculine singular:

• мобільний інтернет

Compare:

• мобільна послуга = mobile service
• мобільне покриття = mobile coverage
• мобільний інтернет = mobile internet

Yes, it is a very common expression. It means mobile internet or often, in practical usage, mobile data/internet access on a mobile network.

So in real-life contexts:

• підключити мобільний інтернет = to activate mobile internet
• безлімітний мобільний інтернет = unlimited mobile internet

It is a normal, natural phrase in Ukrainian.

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

So Пакет послуг can mean:

• a package of services
• the service package
• the package of services

Which one is intended depends on context.

This is very normal in Ukrainian, and learners need to get used to understanding definiteness from the situation rather than from an article.

Yes. Ukrainian word order is more flexible than English, because case endings help show grammatical relationships.

The neutral order here is:

• Пакет послуг включає мобільний інтернет.

But other orders are possible for emphasis, for example:

• Мобільний інтернет включає пакет послуг.
  This would usually sound wrong or unnatural because it changes who is doing the including.

• Мобільний інтернет пакет послуг включає.
  Grammatically possible in a very marked style, but not natural in ordinary speech.

So although Ukrainian allows flexibility, the original sentence is the most natural standard word order for this meaning: subject + verb + object.

There are two main clues:

1. Verb agreement
   Включає is singular, and пакет is singular nominative.

2. Case forms
   Пакет is in the nominative, which is the usual case for the subject.
   Мобільний інтернет is the direct object after the verb включає.

So Ukrainian grammar shows that:

• пакет = the thing doing the including
• мобільний інтернет = the thing being included

Yes, that would also be understandable and natural.

Both verbs can mean include/contain:

• включає = includes
• містить = contains / includes

But включає is especially common when listing features or components of a plan, offer, or package.

So in commercial or service-related language, включає is often the most expected choice.

It is the genitive plural of послуга.

Here is the pattern:

• singular nominative: послуга
• plural nominative: послуги
• plural genitive: послуг

This is a useful form to remember because Ukrainian often uses the genitive plural after quantity-like or container-like nouns, such as:

• пакет послуг = package of services
• набір функцій = set of functions
• група клієнтів = group of clients

In modern Ukrainian, інтернет is commonly written with a lowercase letter when it is used as a general noun, just like in your sentence.

So:

• мобільний інтернет = normal lowercase spelling

You may sometimes see capitalization in older texts or different stylistic choices, but lowercase is standard in everyday modern usage.