Missed Calls?

[faaz23]

I have had many people tell me they have called and I have not seen a missed call on my phone. Or my phone will ring once and the caller will be sent to voice mail or have hung up. They have told me I don't pick up because they hear 4 rings while I only hear 1 ring. I have had many missed calls since switching over to this from my xv 6800. Is there something wrong with my phone or is this just how the phone is?