For the phone effect, you just need to set your eq, lots of high end no lows... i remember seeing on guitargeek that dino from fear factory used to use an ibanez lowfi pedal, not personally tried one tho.
Suppose you could just try setting up an unused channel on your amp for those situations.
Probably the same setup, lots of high end eq setting and lowfi pedal for astronaut type vocals, i suppose youd want to add alot of gain too (maybe) because you want it to crackle right?