No. I factory reset it, and gave to my boyfriend to use when the screen on his phone was cracked. He just put his SIM card in and it worked. The only time you need any type of code is when you're trying to use a bring your own phone program and that's only the apn network code you'd need from whichever carrier has the bring your own phone program.
I am using one right now. Great phone ! It also works with Page Plus Cellular, Just put your Sim in before powering up and it's good to go. It is strictly a CDMA phone.
Aww! I remember what that was like! Now they're 8 and 10! I understand that all your focus had to be on your little one and nothing else until nap time. Thank you for the updated pictures! Good luck with the little one :)