The SOL is based upon the state you lived in when opening the contract or the state you currently reside in. Creditor can choose.
How can I find out which one the creditor chose to use? Do I have to ask them directly?
That's a great question! I'm sure if you call them you can coax the info out of them. I once called a collection agency in regarding one of my accounts in an attempt to settle the account and have it deleted. Well, things got a bit heated and I wound up telling the rep that I decided that I wasn't going to pay her a dime because the account was most definately outside of the SOL. The rep proceeded to give me the exact date that the SOL would expire on my account, as well as a few other juicy tidbits of info.
So my suggestion, call and tell them that your account is outside of the SOL, then wait for the response. Let them give you all of the info you need.
Just make sure they aren't lying to you.
I know my SOL is coming up just unsure if it now on soon. The Original agency is over 6 1/2 years ago.