Если будешь смотреть в телефон, можешь пропустить нужный поворот или сообщение.

In Russian, when если introduces a real future condition, Russian normally uses a future form.

So:

Если будешь смотреть в телефон... = If you are looking at your phone / if you keep looking at your phone...

This is different from English, which usually avoids will in an if-clause. Russian does not avoid the future here.

So the pattern is very normal:

• Если придёшь, позвони. = If you come, call.
• Если будешь спешить, можешь ошибиться. = If you rush, you may make a mistake.

This is about aspect.

• смотреть is imperfective
• посмотреть is perfective

Будешь смотреть describes an ongoing action/process: you are busy looking at the phone, staring at it, keeping your attention on it.

That fits the idea of distraction.

If you said если посмотришь в телефон, it would sound more like if you take a look at your phone or if you glance at your phone once. That is a different idea.

So:

• будешь смотреть = be looking / keep looking
• посмотришь = take a look

Here it means look at or stare at.

Russian смотреть can cover both English watch and look, depending on context:

• смотреть фильм = watch a film
• смотреть на дом = look at the house
• смотреть в телефон = look at / stare at your phone

So in this sentence, do not understand it as watch the phone. It means your attention is fixed on the phone.

In modern colloquial Russian, смотреть в телефон is very common when talking about staring at the screen.

It works a bit like:

• смотреть в окно = look out the window / look into the window
• смотреть в экран = look at the screen
• смотреть в телефон = look at your phone screen

На телефон is also possible in some contexts, but it more naturally suggests looking at the phone as an object. В телефон strongly suggests attention directed into the screen.

Also, after в here, Russian uses the accusative case. For телефон, the accusative looks the same as the nominative, so you do not see a change in form.

Yes, almost certainly.

In modern everyday Russian, телефон often means cell phone / mobile phone / smartphone if the context makes that obvious.

If someone wants to be extra explicit, they might say:

• мобильный телефон
• смартфон

But in a sentence like this, телефон naturally means the phone in your hand.

Russian often omits personal pronouns when the verb ending already makes the subject clear.

Here:

• будешь = you will be
• можешь = you can / may

So ты is understood automatically.

The full version would be:

Если ты будешь смотреть в телефон, ты можешь пропустить...

But that sounds less natural unless you want emphasis, contrast, or special stress.

Here можешь expresses possibility/risk, not just ability.

So in natural English, it can be translated as:

• you can miss
• you may miss
• you might miss

In this sentence, the meaning is basically:

If you keep looking at your phone, you might miss...

So можешь does not mean that you have the skill to miss something. It means that this is a possible result.

Because the sentence is talking about a single possible result: you may end up missing a turn or a message.

• пропустить = perfective = miss something as one completed event
• пропускать = imperfective = be missing things repeatedly / habitually

So:

можешь пропустить = you may miss

If you used можешь пропускать, it would sound more like you may tend to miss things or you may be missing things repeatedly, which is not the main idea here.

Пропустить has several meanings in Russian, including let pass, skip, omit, and miss.

In this sentence, it means miss in the sense of fail to notice or act in time.

So:

• пропустить поворот = miss a turn
• пропустить сообщение = miss a message

It is the same basic idea as in English:

• I missed my stop
• I missed the notification
• I missed the turn

Нужный means needed, the one you need, or in this context often simply the right/correct one.

So:

нужный поворот = the turn you need / the right turn

It does not mean right as the opposite of left. It means the correct turn for your route.

Also, поворот is masculine, so the adjective is masculine too:

• нужный поворот

And because поворот is an inanimate masculine noun, its accusative form looks the same as the nominative form.

Grammatically, no — not directly in this sentence.

Нужный is in the masculine singular form, so it agrees with поворот only:

• нужный поворот

But сообщение is neuter, so if you wanted the adjective to modify it too, you would need:

• нужное сообщение

So the sentence as written most naturally means:

you might miss the turn you need, or a message

If you wanted needed to apply clearly to both nouns, you would say:

Если будешь смотреть в телефон, можешь пропустить нужный поворот или нужное сообщение.

Because Если будешь смотреть в телефон is a subordinate clause introduced by если.

In Russian, such clauses are normally separated by a comma from the main clause:

Если будешь смотреть в телефон, можешь пропустить нужный поворот или сообщение.

If you reverse the order, the comma is still needed:

Можешь пропустить нужный поворот или сообщение, если будешь смотреть в телефон.

So the comma here is standard Russian punctuation for a conditional clause.