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The way to get your GMail account password ***** simply requires, if you set up a phone number for the password ***** information to be sent to, that you have that phone number again.
If the phone number was on the ruined or flooded or lost phone, that's OK: a phone number on a lost/ruined/broken phone, can be assigned over to another phone... provided that the account that phone number was linked to, has been kept paid up in the meantime (otherwise, with the account lapsing owing to lack of payment, the phone number will be free to be assigned to other customers, and probably will be so assigned... though you could contact your (former?) phone co., and ask if that number can still be or become yours again.)
It's good that you know what your cellphone # used to be. That's the ticket! call your (prospective?) phone company, where you are getting a new/replacement cell phone with texting capability, and see if they can assign you that number again, to your replacement cell phone. Do so immediately, I suggest. It may be taken by someone else, otherwise.
As for remembering other email account names... you sent emails from them to someone, and if you remember who you sent emails to, that you are on friendly terms with, email them or contact them otherwise, and have them look at the email(s) you sent them and get the email addresses off them. That's one way to get your old 'email names' back.
There may be other ways too. Let me know, if you even want to check to make sure there is or isn't such a way, to get info back, or password ***** an account back, etc. I'd like to help if it is possible to by advising you.
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