Install Redream from the Google Play Store or Flycast from GitHub.
You cannot play original Dreamcast GD-ROM discs directly on your phone. You must create digital backups, or "rips," of the games you legally own. nulldc apk android link
Despite its popularity, NullDC was eventually discontinued. The exact reasons for its discontinuation are unclear, but several factors likely contributed to this decision: Install Redream from the Google Play Store or
I launched the app. It asked for permissions. This is another critical checkpoint. A Dreamcast emulator needs access to your storage (to read the game files, or ROMs). It doesn't need access to your contacts or camera. I checked the permissions; it only asked for storage. A good sign. Despite its popularity, NullDC was eventually discontinued
Since you cannot use a NullDC APK, here is how to play Dreamcast games on your phone in under 5 minutes.
NullDC was a highly popular, open-source Sega Dreamcast and Naomi emulator developed for Windows PC. It was celebrated for its high compatibility rate and excellent performance on low-end hardware during the late 2000s and early 2010s. Is There an Official NullDC APK for Android?