Missed call alerts when phone busy on another call? I have a Samsung Galaxy Y phone with Gingerbread.

I have just discovered that I do not receive any kind of missed call notifications when my phone is busy on another call.

I am quite shocked as this facility is available even in very cheap, ordinary phones.

How do I fix it? Is it because of some phone settings of mine? or is there an android update? or do I need to install some app? or is the trouble with my network operator?
Go to Settings -> Call settings -> Additional settings and find Call Waiting option (its may be in different address in android 2.3).

Enable Call Waiting it if is not already. If it was already enabled, but you never here beeps or receive notifications when another call happens, I think you should check with or consult your operator.