Look for a mod called "GTA 1 Android Remastered" on reputable modding forums like Gamemodding or ModDB . Avoid random "GTA 1 APK OBB" sites pushing adware.
This is a critical question. Because the game is no longer on the Play Store, many sites offer "GTA 1 APK Download" buttons. Download Gta 1 For Android
A: No. Only fan ports and emulators are available. Rockstar removed their classic "GTA 1 & 2" mobile ports years ago. Look for a mod called "GTA 1 Android