Is there a signal my Samsung Galaxy Core Prime gives off to alert a caller that I am engaged in another conversation before I answer the second caller. I say this because some callers actually say " I see you were on the phone." At this point, I don't know how they know I was on the phone before I took their call. I am really curious about how do they know. If someone has an answer, I will like to hear it.
When I call another Verizon number, and they are already on a call, the ring sound I get has a short tone at the end of the ring.
I don't hear that if they have ringback tones.
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