It’s obviously jailbroken, so do a hard restore and then look up the SIM card’s phone number.
Okay, there’s this problem with Huddler where it DOESN’T bring new posts to the top, so you never see them. Sorry for the late reply.
A hard restore is done by plugging it in, turning it off, and holding the Sleep/Wake and Home buttons for 10 seconds. At the end of the 10 seconds, release Sleep/Wake and keep holding Home until iTunes tells you it’s in recovery mode. Then restore clean.
It’s obviously jailbroken because the only way to change the logo at boot is jailbreaking, and the most common change is the pineapple logo that people who don’t have a clue what they’re doing just leave there.