Control outputs of Arduino pins 2, 3 with Android speech recognition Android app is file APK to be installed manually. File AIA can be opened on MIT App Inventor an easy free program for writing Android apps.
Arduino Uno or Nano is connected via OTG cable. To my opinion the Android speech recognition works well, it can understand my English in foreign accent. If your Android is in a different language you can change the words to your language.
The 4 words in the table can be edited in run time. The words are the speech that switch Arduino output 2 and 3.