Received a Call from the Future: Don't Believe the Successful Me

Traveling back to 1999 with my smartphone, I excitedly dialed my number. A voice from thirty years later came from the other end of the phone: "Don't trust anyone you know, including me now." "You must leave your city before midnight on December 31, 1999, otherwise——" The call was suddenly interrupted, and a red warning flashed on the phone screen: the signal source was abnormal and the future has changed. Before I could react, a new message popped up: "Everything I just said was a lie, please stay." Two future selves are fighting over my decision, and I don't know which one to trust.