Thats why Steam gives you a list of about 20 "recovery" codes when you first set up the mobile app and prompts you to save those in a safe place. Those codes work as login codes but only once each.
If you did not save those codes, well, thats your fault then.

Edit: I see you "lost" all your codes.
Well then you need to get in contact with Steam Support. But you will have to proof that its your account.

so then i'm basically screwed over

You screwed yourself over for not keeping the recovery codes safe somewhere.
Again, contact Steam Support ,give them all the details of your account you have and include some proof that you are the owner. Pictures of serial keys and the like activated on the account.

Also:

Help, I lost (or sold) my phone and can't log in! What do I do?

If possible, you should contact your wireless service provider and get a replacement phone with the same phone number. Steam will be able to send SMS messages to your replacement phone, and you will be able to recover your account as described below.

If you no longer have access to your phone and don't have your recovery code, you'll need the assistance of Steam Support. Use the "Help me with my issue" button at the top right of this page to get help removing your authenticator. If you don’t have access to the email address that is currently associated with your Steam Account please provide proof of account ownership within your ticket.

Since your phone is just broken you can just take your SIM card out and use it in another phone to get your code.

I dont have another phone and dont have the money rn
i did ask steam support waiting on an answer

If the phone is attached to the account you are currently posting from, before doing anything else go to this page:
https://psteamproxy.yuanyoumao.com/twofactor/manage

And click "Get Backup Steam Guard Codes". Put these somewhere safe before proceeding.

Now log out of your current Steam account, and go to:
https://psteamhelp.yuanyoumao.com/

Click Help, I can't sign in
Click I deleted or lost my Steam Guard Mobile Authenticator
Enter your account name, click Search
Click I no longer have access to this phone number
Click Email an account verification code to **********@******.c**

引用自 Ogami：

Thats why Steam gives you a list of about 20 "recovery" codes when you first set up the mobile app and prompts you to save those in a safe place. Those codes work as login codes but only once each.
If you did not save those codes, well, thats your fault then.

You get just one recovery code and its only for removing auth.

You can create 30 separate login codes in steam itself later.

Two different things

I have two phones, and one can't connect to the internet that phone is the phone responsible for sending steam guard codes and confirmations. I want to transfer to the working phone, what do I do?

引用自 smug：

I have two phones, and one can't connect to the internet that phone is the phone responsible for sending steam guard codes and confirmations. I want to transfer to the working phone, what do I do?

https://support.steampowered.com/kb_article.php?ref=8625-wrah-9030#transfer

I figured it out cuh

i know this post is old but my phone is broken and the confirmations have only been sent there. I have aother phone but with no Card to receive those Phone number confiramtions nor do I know my backup codes because I deleted the codes on my folder a long time ago.

This thread was quite old before the recent post, so we're locking it to prevent confusion.