Don’t remember exactly what it was, but I think it was Samsung and was one of the ones where you slid it up to access the keypad. I got it around middle school as a hand-me-down from my dad. I thought it was the absolute coolest thing at the time, despite that was around when my parents were upgrading to smart phones. I’ll definitely have to look it up to see what it was.
Edit:
On GSMArena there is 66 pages of different model Samsung phones and plenty that you slid up to access the keypad. Finding the exact model would be like finding a straw of hay in a needle stack, so I’m giving up after 14 pages.