Hi, I am using for 10 years now my GO720 and I am very happy with it. Only had to replace the battery. Still works flawless with indicating lanes technology ... I have three questions ... 1) I found a GO730 in a disposal bin. It looks in very good condition. When I switch it on it starts up but shows an icon of a memory card indicating that there is no memory card in the slot. My GO720 never had a memory card and the slot is covered with a tape from factory off. I purchased a SanDisk SDHC 32GB speed 10 memory card and installed it in the 730. When I start it up it indicates now something like a disc driver icon and still does not start further up. 2) I bought an original TT remote which works on bluetooth. Does the GO720 and GO730 both have bluetooth. 3) What is the diff between 730 and 720? Any help would be greatly appreciated.