Unfortunately, you can't play CS2 on your smartphone using standalone apps for Android or iOS. However, you can run CS2 on your phone using game streaming services like GeForce Now or Steam Link. The main drawback of game streaming is that their services come with a cost.

Key differences between CS2 and CS:GO include: Game Engine: CS2 uses the Source 2 game engine, offering better visuals and effects. CS:GO used the original Source engine for over 11 years.

To be eligible for a CS2 Limited Test invite players must have CS:GO Prime status, an active official competitive matchmaking Skill Group, and play majority of their official matchmaking games in one of the regions where the Limited Test is available."

Check your in-game notifications in the CS:GO main menu. If you got into the CS2 beta test, you'll see a popup telling you so (or else a notification in your left-hand main menu bar with a message about the beta). Just click “Enroll” on the popup, and you're good to go! You may need to restart CS:GO to play the beta.