Se você clicar no botão azul, o celular vai se conectar sozinho.

Because after se meaning if, Portuguese normally uses the future subjunctive when the condition refers to a possible future action.

So:

• se você clicar = if you click / if you happen to click
• se você clica is not the normal choice here for a one-time future condition

This is a very common pattern in Portuguese:

• Se você puder, me avise. = If you can, let me know.
• Se ele chegar cedo, saímos. = If he arrives early, we’ll leave.

For many verbs, the future subjunctive looks like the infinitive, so clicar looks unchanged.

In Brazilian Portuguese, você means you, but grammatically it takes third-person singular verb forms.

So you get:

• você clica
• você vai
• você pode

not the forms used with tu.

That’s why the sentence has:

• se você clicar
• o celular vai...

This is completely normal in Brazil.

The comma separates the if-clause from the main clause.

Structure:

• Se você clicar no botão azul, = if you click the blue button
• o celular vai se conectar sozinho. = the phone will connect by itself

In Portuguese, when the subordinate clause comes first, a comma is normally used. If the main clause came first, the comma would often disappear:

• O celular vai se conectar sozinho se você clicar no botão azul.

No is a contraction of em + o:

• em = in / on
• o = the
• em + o = no

So:

• clicar no botão = click on the button

This contraction is mandatory in normal Portuguese.

Other common examples:

• na = em + a
• nos = em + os
• nas = em + as

No. The two se words do completely different jobs.

1. Se at the beginning means if.

   • Se você clicar... = If you click...

2. se in se conectar is part of the verb conectar-se.

   • conectar-se = to connect oneself / to connect

In this sentence, o celular vai se conectar means the phone will connect itself, or more naturally in English, the phone will connect.

So the first se is a conjunction (if), and the second se is a reflexive/pronominal pronoun.

Both are possible, but vai se conectar is much more common in everyday Brazilian Portuguese.

• vai se conectar = near-future structure, very natural in speech
• se conectará = simple future, correct but more formal or less conversational

Brazilian Portuguese often prefers ir + infinitive for future meaning:

• vou fazer instead of farei
• vai chover instead of choverá
• vai se conectar instead of se conectará

So the sentence sounds natural and modern.

In Brazilian Portuguese, placing the pronoun before the infinitive is very common and natural:

• vai se conectar

You may also see more formal or European-style placement such as:

• vai conectar-se

But in Brazil, vai se conectar is the usual everyday wording.

So for a learner of Brazilian Portuguese, vai se conectar is the form to remember.

Literally, sozinho often means alone or by oneself, but in this sentence it means something like:

• by itself
• on its own
• automatically

So:

• o celular vai se conectar sozinho = the phone will connect by itself / on its own

It suggests that after you click the button, no further action is needed.

Because sozinho agrees with o celular, which is masculine singular.

• o celular → masculine singular
• therefore sozinho

If the subject were feminine, it would change:

• A impressora vai se conectar sozinha.

If plural:

• Os aparelhos vão se conectar sozinhos.
• As caixas vão se conectar sozinhas.

Portuguese uses definite articles much more often than English does.

So o celular can mean:

• the phone
• sometimes even the phone in a general, context-known sense

English often drops articles where Portuguese keeps them. That’s very normal.

Compare:

• O celular está carregando. = The phone is charging.
• A internet caiu. = The internet went down.
• O João chegou. = João arrived.

So o celular sounds natural and expected.

Yes, celular is the normal word in Brazil for cell phone / mobile phone.

In European Portuguese, the usual word is telemóvel.

So if you are learning Brazilian Portuguese, celular is exactly the word you want here.