چون اینترنت خانه خراب بود، با گوشی به خواهرم پیام دادم.

A simple transliteration is:

chon internet-e khâne kharâb bud, bâ gushi be khâharam payâm dâdam.

A few helpful notes:

• اینترنت خانه is pronounced internet-e khâne. The -e is the ezafe sound, even though it is not normally written here.
• گوشی usually sounds like gushi.
• خواهرم is khâharam = my sister.

چون means because or since. It introduces the reason:

• چون اینترنت خانه خراب بود = because the home internet was down/broken

It is a very common way to start a reason clause in Persian.

No. In this sentence, it should be divided like this:

• اینترنتِ خانه = the home internet / the internet at home
• خراب بود = was broken / was down

So the structure is:

چون [اینترنتِ خانه] [خراب بود]، ...

That matters because خانه‌خراب can be a separate expression in other contexts, but that is not what is happening here.

This is because of the ezafe construction.

In Persian, when one noun is linked to another noun, you often pronounce an -e between them:

• اینترنتِ خانه = the internet of the house / home internet

But after a consonant, that ezafe sound is usually not written in normal spelling. So:

• written: اینترنت خانه
• pronounced: internet-e khâne

This is very normal in Persian writing.

Literally, خانه can mean house or home depending on context. Here, the most natural English idea is home:

• اینترنت خانه = home internet / the internet at home

It does not have to mean a specific physical house in a strict architectural sense.

Yes. خراب literally means broken, but for things like devices, connections, or services, it often means:

• not working
• down
• out of order

So اینترنت خانه خراب بود naturally means something like:

• the home internet was down
• the internet at home wasn’t working

Other possible Persian expressions are:

• قطع بود = was disconnected / was out
• کار نمی‌کرد = wasn’t working

But خراب بود is completely understandable and natural.

با means with, and گوشی here means phone, usually mobile phone in everyday Persian.

So با گوشی means:

• with my phone
• using my phone
• on my phone

In context, it suggests the speaker used the phone instead of the home internet connection.

Also, in modern spoken Persian, گوشی often means cell phone / mobile phone, even though historically it can refer to a receiver or handset.

Because پیام دادن normally marks the receiver with به.

So:

• به خواهرم پیام دادم = I sent a message to my sister / I messaged my sister

This is a common pattern:

• به دوستم زنگ زدم = I called my friend
• به مادرم گفتم = I told my mother
• به خواهرم پیام دادم = I messaged my sister

So به here marks the person who receives the message.

خواهرم = خواهر + -م

• خواهر = sister
• -م = my

So:

• خواهرم = my sister

This -م is a possessive ending. Some other examples:

• دوستم = my friend
• برادرم = my brother
• کتابم = my book

Yes, دادم literally means I gave, but Persian very often uses light-verb constructions: a noun plus a common verb such as دادن, کردن, or زدن.

So:

• پیام دادن literally = to give a message
• natural meaning = to send a message / to message / to text

This is a very common Persian pattern. For example:

• تلفن کردن = to phone
• تصمیم گرفتن = to make a decision
• کمک کردن = to help

So پیام دادم is an idiomatic and normal way to say I messaged or I sent a message.

Because the whole sentence is talking about a completed past situation.

• بود = was
• دادم = I gave / I sent

The clause with بود gives the background situation:

• the internet was down

The main clause gives the action that happened because of that situation:

• I messaged my sister

So the tense works just like in English: Because the home internet was down, I messaged my sister.

Yes. Persian can put the because clause first or second.

Current order:

• چون اینترنت خانه خراب بود، با گوشی به خواهرم پیام دادم.

Also possible:

• با گوشی به خواهرم پیام دادم چون اینترنت خانه خراب بود.

Both are natural. When the چون clause comes first, it often sets up the reason before the main action.

The second clause is:

با گوشی به خواهرم پیام دادم

A rough breakdown is:

• با گوشی = with the phone
• به خواهرم = to my sister
• پیام = message
• دادم = I gave/sent

So Persian keeps the verb at the end, which is very typical. You can think of the structure as:

[using my phone] [to my sister] [a message] [I sent]

That final-verb pattern is one of the most important things to get used to in Persian.