I have been experiencing the "SIM card not detected" problem recently. I tried the soft and hard reset solutions suggested elsewhere in these forums but no difference. I am sure the problems only started when I upgraded the OS. Palm's answer was to ask me to return the unit for a replacement under warranty. Question: I am sure that the problem was introduced when I upgraded the OS - does anyone know if the replacement unit will have the latest version of the OS? I am hoping that it will not be so that I may ignore the update and have a working phone. Anyone have any tips on how to get problem-free mobile phone functions? This is the second time I have had to get a replacement under warranty - I only bought the unit in December so it has been a huge disappointment.