[AC Question]

Please help me how can I swap my existing game to my new phone

[B. Diddy]

Welcome to Android Central! It depends on the game. Some games will save your progress to the cloud, which is ideal. If it doesn't save to the cloud, then you might be able to copy a save game file from the game's directory to the new phone, but there's still no guarantee that it'll work. You might want to email the game's developer about this.