if you reset your samsung phone but no remember samsung account and gmail account Pin Code , Swipe Code, Backup Password use this way is very easy ...
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From Zone GSM
just follow steps :) How to unlock samsung acount reactivation lock works in any samsung device Samsung Galaxy s6, s5,Alpha,Samsung s4 Note 4,note 3 etc..
In this video tutorial I'll show you how to backup your data (contacts, calls, messages, apps etc) on Samsung account on Samsung Galaxy S8, S8+ and NOTE 8.