I think Tracy Martin had the pin number for the t-mobile account, but he didn't have the local password for the phone. He had the pin number, because the account was in his name. He didn't have the phone password, because the main reason Trayvon Martin had a password was to keep his parents from spelunking around on his phone.
I've seen local defense attorneys in Florida advise clients to password protect their phone, but, as far as I know, TM was never arrested in Florida. I'm not familiar with youth culture. Do teenagers routinely password protect their phone?