I have LG G2 Mini running Android 4.4.2 with Kernel 3.4.0. If you need Build number or Software Version or Baseband version , let me know.
I tried to search but couldn't find anything useful for how to disable the reading voice on incoming calls?
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The "reading voice" on incoming calls may be part of the Accessibility Features that are a part of Android. It also seems that LG has a setting for enabling Voice Notifications for calls and texts - try that too.
Ensure that the following settings are turned off/unchecked: