Determining/stopping random phantom notifications during calls I recently switch carriers and got a used Galaxy S4 to replace the one I would no longer be using.  The phone was already cleaned up but I did a factory reset on it myself to be sure.  The problem I have is that one or more times during a call the phone vibrates and/or beeps as though it has a notification for me.  When I check the notifications (during or after the call) there are none.  

This happens almost every call, and within about the first 1-2 minutes of the call, but it is not at a consistent time.  I am not getting these phantom notifications any other time, just when on a call.  I'm not a very heavy caller, so I don't know when this started, but it has been doing it for more than a month at least.  

It will happen even immediately after rebooting the phone and occurs whether using the handset or the wired headset (don't recall if I've tried it with BT).  I have disabled all in-call alerts in the settings (including roaming, data, and connection alerts) and every notification option I can find within apps (excepting the ones I need) but to no avail.

Is there any way to disable this, or at least to determine what is causing the false notifications?  

Additional info:


Carrier: Sprint
Phone Model: SPH-L720
Android Version: 4.4.2
Rooted: YES
ROM: Stock from carrier (Samsung Touchwiz)
On some Samsungs, they have a feature called Minute Minder. It will notify you around every minute of your phone call (it is usually 5-10 seconds before the actually minute mark). For people who don't have unlimited minutes, this allows them to easily know how many minutes have passed.

For the original Galaxy S, the setting is located under

Settings -&gt; Call Settings -&gt; All Calls -&gt; Call Status Tones -&gt; Minute Minder

I think with the Galaxy S 4 it's been moved to

Settings -&gt; My Device -&gt; Call -&gt; Call Alerts -&gt; Minute Minder

I'm not positive if this is the cause, but it sounds probable.