I do general tech support and the frequency with which i have run into this problem when someone has broken their phone screen and need to recover data from their phone has me tearing my hair out. Have broken phone, connect to a PC and the PC tells you change the USB mode or unlock the phone before it can do anything. Surely their must be some way of setiing things up so you can unlock or change the mode from the PC. Sometmes you can attach a Mouse, but then you can't change the mode unless you then use the mouse to pair a bluetooth mouse. Broken screens are so common, and are probably the number 1 reason prompting people to upgrade a phone they wish to transfer data from, it is hard to beleive that this has not been thought though and you end up staring at a message to change the mode on the phone whose screen is unsuable.
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