I've enjoyed phone sex with other guys many times. It can be very hot talking with another guy about all kinds of kinky straight sex. The key to it is being imaginative and very verbal. Doesn't work so well when it's just two dudes grunting and saying "fuck yeah" over and over again... Heh...
One of my hottest sex experiences is when I got my wife to call one of the phone sex numbers, put it on speaker phone and she gave phone sex to 3 guys and made then cum while I licked her pussy. Then she fucked me hard. Awesome night. She only did it once, said she felt to dirty. It was in this bed.