Call of Duty: Mobile is nothing different from the desktop version of the game and it has the multiplayer mode. You can choose to join an existing squad or you can also create a team with your friends. Once you join a team or create one, you can start a match and fight with the other team. You will be the winner if you complete your target first.
However, geo-restrictions might make teaming up with friends from different locations or countries close to impossible. You can get over all this if you are connected to a trustworthy VPN for gaming. When there is a new release and if it is available only in a certain location, with a VPN you can access it before anyone else in your location gets access to it.