So I have been using my phones 16gb memory card to listen to music on my computer at work for most of the day today. I go out to lunch and bring the phone with me as usual. I notice that I have 5 missed calls and 9 texts that have come in over the last few hours. My phone did not make a peep and I now realize why, with the memory mounted via the computer the phone has no access to the memory where the ringtones are stored and thus the phone has no way to make sound...