Two women, standing at a fence, are each talking on their cellphones, while two men sitting on the opposite side of the fence are having a conversation.
Four people are talking to each other outside.
Women who are each talking on their cellphones are not talking to each other.
TALKING IN A CELL PHONE IS DIFFERENT FROM HAVING A DIRECT CONVERSATION BY TALKING TO EACH OTHER.
one cant be talking to each other  and talk on their cell phone at a same time.