З одного боку, eSIM зручна, з іншого боку, дорога.

It means on the one hand, on the other hand.

This is a very common Ukrainian pattern for presenting two contrasting sides of something:

• З одного боку = on the one hand
• З іншого боку = on the other hand

Literally, it is something like from one side ... from the other side, but in normal English you would usually translate it as on the one hand ... on the other hand.

Both одного and іншого are in the genitive case, and боку is also genitive.

The preposition з often requires the genitive when it means from/off/out of. In this fixed expression, Ukrainian uses:

• з одного боку
• з іншого боку

Word-by-word:

• з = from
• одного = of one
• іншого = of the other
• боку = side

So grammatically, it is built as a prepositional phrase with the genitive.

Because in Ukrainian, the present-tense verb to be is usually omitted.

So:

• eSIM зручна literally looks like eSIM convenient
• but it means eSIM is convenient

And:

• дорога means expensive
• so the second part means (it is) expensive

This is completely normal in Ukrainian. If you translate word-for-word into English, it may feel incomplete, but in Ukrainian it is standard.

Because eSIM is being treated as a feminine noun here.

That happens because speakers often understand eSIM as something like an implied SIM card:

• сім-картка is feminine
• so the adjective becomes feminine too:
  • зручна
  • дорога

So the sentence treats eSIM as feminine:

• eSIM зручна
• eSIM дорога

This is very natural in modern usage. With technology words, Ukrainian sometimes assigns gender based on an implied Ukrainian noun.

Yes, дорога can mean road, but here it is an adjective, not a noun.

There are two different words/forms that happen to look the same:

• дорога = road (noun)
• дорога = expensive (feminine form of the adjective дорогий)

In this sentence, it is clearly the adjective, because it describes eSIM:

• eSIM зручна, дорога
• eSIM is convenient, expensive

So context tells you which meaning is intended.

Ukrainian often leaves out repeated words when they are already clear from context.

So:

• З одного боку, eSIM зручна, з іншого боку, дорога.

literally works like:

• On the one hand, eSIM is convenient; on the other hand, (it is) expensive.

The subject eSIM does not need to be repeated in the second part, because it is already understood.

You could repeat it for emphasis or clarity, but it is not necessary.

The commas separate the introductory contrast phrases and the two balanced parts of the sentence.

Structure:

• З одного боку, = introductory phrase
• eSIM зручна,
• з іншого боку, = another introductory phrase
• дорога.

Ukrainian punctuation often marks these discourse phrases clearly with commas. The commas help show the contrast and rhythm of the sentence.

You may hear з однієї сторони / з іншої сторони, especially in everyday speech, but з одного боку / з іншого боку is generally the more standard and widely recommended form for this meaning.

So for learners, the safest choice is:

• з одного боку
• з іншого боку

That is the expression you should actively learn first.

They are feminine singular nominative adjective forms used predicatively.

Dictionary forms are:

• зручний = convenient
• дорогий = expensive

Feminine singular forms:

• зручна
• дорога

They agree with the feminine subject eSIM.

So the pattern is:

• masculine: Телефон зручний.
• feminine: eSIM зручна.
• neuter: Місце зручне.

Even though these adjectives come after the noun in this sentence, they are still agreeing with it in gender and number.

Yes. Even if a borrowed word is written in Latin letters, speakers still usually fit it into Ukrainian grammar as much as possible.

Here, eSIM behaves like a noun with feminine agreement:

• eSIM зручна
• eSIM дорога

So the writing system does not stop Ukrainian from assigning grammatical gender and making adjectives agree.

This is common with brand names, tech terms, and abbreviations in modern Ukrainian.

You can understand it that way to see the structure, but that is usually not the best English translation.

A more natural English translation is:

• On the one hand, eSIM is convenient; on the other hand, it is expensive.

So:

• literal sense: from one side / from the other side
• natural meaning: on the one hand / on the other hand

As a learner, it is useful to know both, but you should usually translate the whole expression idiomatically.