I'm having the same problem, put in too long a password. If I do a factory reset will all my contact information be lost, I only have this phone 1 day.
Factory reset wipes everything that is on the Phone's internal storage. If you have saved your Contact's names and numbers on the phone itself then they are lost too. If you have saved that info to Google instead of the phone then they are not wiped.
In any case for the future, you should save all your contacts to Google instead of the phone. Back up your photos and videos to Google photos (or other cloud based services) and same with Music too. The phone can break so easily and you want to make sure you have no critical information that is only on the phone.
My battery is still running out quickly. I've tried factory reset and only when I force stop and disable media storage and download manager does the battery work properly. What use is the phone if I have to do that? I've been thinking about other smartphone options...I dunno sammy...better get it together...if the s8 gives me any problems at all....that's gonna be it for sammy..
Hey there. Can you try some of the battery saving tips found here: https://us.community.samsung.com/t5/Galaxy-S-Phones/How-to-Battery-Tips-and-Troubleshooting/m-p/5015...
Just let us know how those steps go! That will give the Community a much better direction to help you out.
Battry life issues were good on my S6 Active when it worked. I broke the screen and now I can't pay someone to fix it. Best Buy can't fix it, the guy in the mall can't get the parts, Samsung authorized repair center wont fix it and Samsung wont fix out of warrenty repairs at this time. Don't break it cause you will be out $600 dollars if you do.