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You need your current password to change it, and you need your most recent password to do recovery. As far as I know, there isn't any other option. Forgotten password is not an option.

So, the only option is to really take care of my phone. Once this lost or broken, goodbye steemit! 😔 haha anyways, thanks for your time.

This is old now, but I see people post this problem of "I forgot my password but my phone remembers"...

I hope you've figured out since then that if your phone remembers the password to any of your accounts that you forgot, you can just go find out what that password is from your phone's password storage... :)