This game though fun, has it share of glitches. I ran across mini map glitches, mission glitches where the mission fails before it begins, unbeatable missions because too much of an upgrade (city takeover uprade results in an unbeatable mission), etc.
You can't call them because once you beat the game, it loads before the final mission so you can choose the other option. And most are occupied at that point in the game. --- Playing Now: Modern Warfare 3(PS3) Soon: