Dont worry again even if you are out of coverage.because almost all mobile networks have introduced missed call alerts.vodafone do have it!but no one has it free!!!!!but we have a MCA trick to activate missed call alert trick for free.it has been tested in west bengal and also works in its major city kolkota.
VODAFONE Free Missed Call Alert:
Dial
*62*+919732097515#
hope this free missed call trick works for you.