A variant on phone tag wherein the caller trying to contact you decides to leave an exceedingly long message, forcing you to listen to it before calling back, and thus spend several minutes "frozen" while hearing him or her blather on.
Another way to play is to try to call the person back just seconds after you've missed their call, so you'll either get a busy signal or have your call ignored while they're still leaving their message on your phone.
Each of these scenarios has the potential to last for hours.
Erica: Should I call you while you're at work and you can hit me back while you're on break?
Seth: Nah, I don't wanna play phone freeze tag with you all night. My job is stressful enough as it is.