matt bellamy uses a digitech whammy. you could definitely approximate the sound with a boss ps-5, ps-3, or hr-2 (probably not a ps-2), but the boss effects have a slightly more sterile sound to them than a whammy.
ps-3 is a pitch shifter delay. ps-5 has the harmonizer
i phaser is more like a linear phase. phase modulator varies the phase signal so you have more like a wavy phase. feel free to correct me if im mistaken hehe
the effect in the clip is basically a pitch up effect with delay. so any pedal/s that can do that will suffice