When callers dial my cell and I don't answer, I can check their number under "missed calls" ... as long as they don't leave a voice mail. However, if they wait until my voice mail answers, then their number won't show up in the missed call list. This can be frustrating when someone mumbles their number when they leave a message.

Is this a limitation of my phone, or a limitation of T-mobile's network, or is there some setting I need to adjust?