Like most Call of Duty titles, the Nuke is available in Call of Duty: Mobile as a killstreak weapon in Multiplayer Mode. There are two things players will need to do to unlock and use the Nuclear Bomb in this game.
Unlocking The Nuclear Bomb
Players will need to unlock the ability to use the nuke by reaching Level 20 to unlock the killstreak benefit. Once that is done, players need to take on the hard task of reaching the in-match requirements to use it. To use the Nuke, players need to get a 20-man killstreak. Killstreaks reset when players die, so essentially they need to get the kill on 20 foes without dying.
When the player meets the in-game requirements for the Nuclear Bomb, a 'launch nuclear bomb' button will appear on the hub. Hit it, and the nuke will eliminate all enemies on the map. It rewards the team with 5 points but this doesn't completely end the match. Nevertheless, that's a lot of points for your team.
Detonating the weapon also earns the player two medals. The player gets the Nuclear Killer medal for using a Nuclear Bomb to kill enemies and the Ultimate Terminator medal, which is received upon activating the Nuclear Bomb.
One important thing to note, though, is that killstreak points only are counted for normal weapon kills. If you use a drone or other scorestreak offensive gadget, the kills from it will not count towards the 20 killstreak goal.