After entering the game, use each weapon to kill 30 robots (do not die during this period). When the nuclear bomb prompt is triggered, you do not need to release the nuclear bomb. Instead, quit the current game, re-enter the lobby, switch to a new weapon, and repeat the above steps until you have completed 25 weapons. The phone card will be unlocked once you have completed all 25 weapons. At this time, exit the game and inform customer service that you have completed it.
