The question speaks. I am not asking about ringtones heard by me or those calling me. I am asking about how to disable the hold music heard by those to whom I put on hold whilst attempting to add another caller using T-Mobile and a Samsung Galaxy S5 designed for T-Mobile. Example: I'm on a conference call. I have to make another call. I put the group on hold assuming the conversation will resume without me for the brief duration of my other important call only to find out the conference call was over early upon returning. How embarrassing it was to additionally find out it was intrusive loud music from my phone while I was on the other call that everyone adjourned the meeting early. I'm lucky if I still have a job.