You need to type it this way:
M E P <(If it's peral you click twice on the "P" to get it, make sure you don't hold ALT / Shift)
2 <(It's a number, Hold the ALT button and type "2" once)
Some models, you need to hold the ALT and type it together as numbers.
Also make sure you have a SIM card inside your Blackberry while doing this.