New Cel, Blocked Cel (Medellin, Colombia)

I bought a brand new Cel phone today, with the help of my friend David. Actually, my friend Leticia bought one as well, they're identical! Teehee. I have even received my first phone call on it... so it works. But then, stupid me, I decided I would fool around with the functions (all in Spanish of course) and now I have locked myself out of my new 'effing phone! Mierda!