How to restore iPhone 4s, activation lock, login.

Do you still have the phones purchase paperwork? If you do you should be able to get the phone unlocked if you remember the original email account you used to link it to or your iCloud account. Visiting an Apple Store with this info and proof of ownership is all you'll need.

The only rub here is the iPhone 4 is so old they may give you a hard time unless you are buying a new phone and what to recover the stuff to the new phone. so even if you don't need the phone t might be a way to get them to do it and then just return the phone after you've gotten everything off.