Using mobile phones for selfie helps develop eye contact -connection।
Using mobile phones for video calls helps one socialise and develop understanding of social communication।
Using mobile phones for listening recorded call records will help kid understanding conversations।
But if u are using for showing videos to kid or for rhymes or repititive content, u r wasting time and life।
Remember learning abcd or 1234 or counting or animal or repititive content recognition is not important in life। Before teaching ato z alphabets, teach the kid ato z relatives by picture face video call and names।