Often I find the need to be on calls when I have poor signal strength. When I am in the midst of a call, and the call drops, I sometimes am unaware that the call has dropped (for a while). I some cases, I end up talking to myself for a while before I become aware of the dropped call. I would love it if, whenever a call ends due to being dropped, that I get an alert tone. Is there any way to make this happen? I would accept an alert whenever a call ends, if that was available. Is there a means to accomplish this on a Razr, or an app that would do this? I am running stock ICS, and am not rooted.