hanagoe no mama de ha, denwa de hanasite mo koe ga tiisaku kikoeru kamo siremasen.

鼻声 means a nasal voice or stuffed-up sounding voice. It is often used when someone has a cold, allergies, or a blocked nose, so their voice sounds different from normal.

So in this sentence, the speaker is talking about staying in that nasal-voice condition.

まま means remaining as it is or in that state.

So 鼻声のまま means while still having a nasal voice or without changing from that nasal-voice state.

A natural way to understand it is:

• 鼻声のまま = still with a nasal voice
• 鼻声のままでは = if you stay like that / in that condition

When まま follows a noun, that noun usually connects with の.

So:

• 鼻声 = nasal voice
• 鼻声のまま = remaining in a nasal-voice state

This is similar to how nouns often connect to other noun-like expressions with の.

Compare:

• 子どものまま = remaining a child
• 昔のまま = just as it was before
• 鼻声のまま = still having a nasal voice

Here, では gives the phrase a conditional sense, like if it stays that way or in that situation.

So 鼻声のままでは means something like:

• if you remain with a nasal voice
• as long as your voice is still nasal
• in that condition

It sets up the condition for the rest of the sentence.

The particle で here marks the means or situation: by phone / on the phone.

So:

• 電話で話す = to talk on the phone

This is very common in Japanese. で often marks the method or tool used to do something.

Examples:

• 日本語で話す = speak in Japanese
• バスで行く = go by bus
• 電話で話す = speak by phone

〜ても often means even if or even when.

So 電話で話しても is literally something like:

• even if you talk on the phone
• even when speaking on the phone

In this sentence, it has a concessive feeling: even if you do talk on the phone, your voice may still sound quiet.

It is not just a simple sequence like talk and then... It adds the idea that even under that circumstance, the following result may happen.

Because 声 is the thing that sounds a certain way, so it is treated as the subject of 聞こえる.

• 声が小さく聞こえる = the voice sounds quiet / the voice is heard as quiet

With 聞こえる, the thing that is heard is often marked by が.

Compare:

• 声が聞こえる = I can hear a voice / a voice is audible
• 音が大きく聞こえる = the sound seems loud

Using を would not fit this structure.

Because 小さく is the adverbial form of the い-adjective 小さい.

When an い-adjective modifies a verb, it usually changes 〜い to 〜く.

Here, 小さく modifies 聞こえる, so:

• 小さい = small, quiet
• 小さく聞こえる = sound quiet / be heard as quiet

This is the same pattern as:

• 早い → 早く
• 強い → 強く
• 大きい → 大きく

聞く means to listen or to hear as an action you do intentionally.

聞こえる means to be heard, to sound, or to be audible. It describes how something reaches the ear, not a deliberate action by the listener.

So:

• 聞く = to listen to something
• 聞こえる = something is heard / sounds a certain way

In this sentence, the point is not that someone is trying to listen. The point is that your voice may come across as quiet. That is why 聞こえる is the natural choice.

Not necessarily. It means the voice sounds quiet or comes across as quiet to the listener.

That could happen because of:

• a nasal voice
• the phone connection
• unclear pronunciation
• muffled sound quality

So the sentence is about how the voice is perceived, not only about actual volume.

かもしれません means might, may, or perhaps. It shows uncertainty and makes the statement less direct.

So the speaker is not saying this definitely happens. They are saying it is possible.

• 聞こえる = it sounds quiet
• 聞こえるかもしれません = it may sound quiet

This is a very common polite way to soften a statement.

Yes, that is a good idea.

It is helpful to recognize it as:

• 鼻声 = nasal voice
• のまま = in that state
• では = if that is the case / in that condition

Together, 鼻声のままでは works as one condition phrase at the start of the sentence.

If you learn it as a chunk, it becomes easier to understand similar patterns, such as:

• このままでは = if things stay like this
• そのままでは = if it stays that way
• 元気がないままでは = if you remain not feeling well

Yes. A more casual version could be:

鼻声のままだと、電話で話しても声が小さく聞こえるかもしれない。

Changes include:

• では → だと for a more casual conditional feeling
• かもしれません → かもしれない for plain style

The overall meaning stays very similar.