Google Messages (SMS+RCS) (https://play.google.com/store/apps/details?id=com.google.android.apps.messaging) Runs in the background. QKSMS is a good FOSS replacement. WARNING: Removing this may cause issues with receiving 2FA verification text messages and calls from Google on some devices. Please let us know your experience with this on https://github.com/0x192/universal-android-debloater/pull/250 (give your phone model + Android version)
Phones target this application