One way to do it, if you login to your accs and check the phone number under: https://twitter.com/settings/devices.
Another way if you login to the accs using the phone number (as if it were your username or email address) and password. Given that you know the phone number and all the passwords, you can go through the list of your accounts one by one.
If you have a lot of accs, both of these processes can be automated with iMacros easily.
Or when you add the add the phone number to an account, by default Twitter makes the account discoverable by phone number unless you untick the bracket. If you left the account(s) discoverable, you can follow this guide to find all the accs tied to a phone number: https://support.twitter.com/articles/101002
One way to do it, if you login to your accs and check the phone number under: https://twitter.com/settings/devices.
Another way if you login to the accs using the phone number (as if it were your username or email address) and password. Given that you know the phone number and all the passwords, you can go through the list of your accounts one by one.
If you have a lot of accs, both of these processes can be automated with iMacros easily.
Or when you add the add the phone number to an account, by default Twitter makes the account discoverable by phone number unless you untick the bracket. If you left the account(s) discoverable, you can follow this guide to find all the accs tied to a phone number: https://support.twitter.com/articles/101002