MetaMask
Open up MetaMask and click the image in the top right corner.
Click on settings, then Security & Privacy, and hit Reveal Secret Recovery Phrase.
This will then prompt you to enter your password to see your secret recovery phrase.
You can then enter this secret recovery phrase into your Phantom wallet when prompted during onboarding.
Coinbase Wallet
Open up Coinbase Wallet and click on Settings in the bottom right corner.
Click Show recovery phrase and enter your password.
This will then prompt you to enter your password to see your secret recovery phrase.
You may then enter this secret recovery phrase into your Phantom wallet.
Trust Wallet
In the Trust Wallet mobile app you can start by hitting the settings in the bottom right corner.
Then select "Wallets" at the top of the settings.
Click the "i" on the right side of the intended wallet and hit Show Secret Phrase.
After entering your password you will need to check the three circles before seeing your secret recovery phrase.
Rainbow Wallet
Open up Rainbow Wallet and click on the cog wheel in the top left.
Hit Backup at the top of the settings, then select View secret phrase.
You can then enter this secret recovery phrase into Phantom.