I have a couple social media accounts i want to use on a new phone ive got. The old phone i believe is infected with deep-malware. If I switch 2fa to my new phone which uses the same number but connected on a seperate network and change their passwords, could malware be transfered onto the new device? (Facebook, email, Discord, etc.)
If you download the social media apps on the new phone from authoritative sources, I'm not sure how malware from another device could infect your new phone.
2FA would not help, because you would be logging into your accounts, and if there was some way to transfer the malware automatically, then it would happen after you used 2FA. Same thing for "changing passwords".
Using the same network will also not matter. Social media apps do not transfer data on the local network: they connect to servers on the Internet.
In short: malware does not work like that.