tuuwameisai wo kakuninsuru.

It is read:

つうわ めいさい を かくにんする

More precisely:

• 通話明細 = つうわめいさい
• を = を (pronounced o)
• 確認する = かくにんする

In normal Japanese writing, you would usually write it without spaces:

通話明細を確認する

通話明細 is a noun meaning something like call details, call statement, or phone usage details.

It breaks down as:

• 通話 = telephone conversation / phone call
• 明細 = details / itemized statement / breakdown

So together, 通話明細 refers to a detailed breakdown of phone calls, often in a billing or account context.

を marks the direct object of the verb.

Here:

• 通話明細 = the thing being checked
• 確認する = to check / confirm

So 通話明細を確認する means to check the call details.

A very literal structure would be:

• 通話明細 = call details
• を = object marker
• 確認する = check/confirm

確認する is a suru-verb.

That means:

• 確認 by itself is a noun meaning confirmation or checking
• adding する makes it a verb: 確認する = to confirm / to check

This pattern is very common in Japanese:

• 勉強する = to study
• 電話する = to call
• 確認する = to confirm/check

So this sentence uses a very common noun + する pattern.

する is the plain/dictionary form.

You often see dictionary form in:

• headings
• menu items
• instructions
• app buttons
• neutral written descriptions
• casual speech

If you wanted to make it polite, you could say:

通話明細を確認します。

That would sound more like a normal polite sentence: I will check the call details or check the call details depending on context.

Yes. Japanese often omits the subject when it is obvious from context.

So 通話明細を確認する could mean things like:

• I check the call details
• to check the call details
• check the call details
• (someone) checks the call details

The exact meaning depends on where it appears. In an app or website, it may function more like a menu label: View/Check call details.

Not exactly.

• 見る = to look at / to see
• 確認する = to check, confirm, verify

So 確認する sounds a bit more purposeful. It implies checking something carefully or verifying information, not just casually looking at it.

For example:

• 通話明細を見る = look at the call details
• 通話明細を確認する = check/confirm the call details

In many situations, both could work, but 確認する sounds more formal and more deliberate.

Because 通話明細 is a compound noun.

Japanese often combines nouns directly to make one larger noun, especially in formal, technical, or business language.

So:

• 通話
  • 明細 → 通話明細

This is similar to how English makes compounds like:

• phone bill
• account details
• train schedule

No particle is needed between the two parts.

It is natural, but it sounds somewhat formal or administrative.

You are likely to see 通話明細を確認する in places like:

• mobile carrier websites
• account pages
• billing systems
• customer support instructions
• app menus

In casual conversation, someone might say something a little less formal depending on the situation, such as using 見る instead of 確認する.

The order is:

object + を + verb

So:

• 通話明細 = object
• を = marks the object
• 確認する = verb

This is a very standard Japanese pattern.

English says:

• check the call details

Japanese says:

• call details + object marker + check

Since Japanese verbs usually come at the end, this word order is completely normal.

Yes. 確認する can mean both to check and to confirm, depending on context.

In this sentence, check is usually the most natural translation, especially for an account or billing screen.

But the core nuance is that you are making sure of something, verifying it, or reviewing it carefully.

Usually, no.

Standard Japanese writing would normally be:

通話明細を確認する。

Spaces are sometimes added in teaching materials to make the sentence easier to read, but they are not normally used this way in ordinary Japanese text.

A common polite version is:

通話明細を確認します。

If it were an instruction to the listener, you might also see:

• 通話明細をご確認ください。 = Please check the call details.

That version is especially common in customer service, websites, emails, and formal notices.