Is there a way to figure out my phone lock?

I got a new phone a little less than a week ago, and I changed my phone lock password too something else, and then last night I don't remember changing my password for it, but then i tried the old phone lock password and it said it was the wrong password. Is there a way that I can retrieve my password, without accessing anything on my phone {because i cant at all}. By the way I have a T-Mobile Samsung Gravity.
 
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