I just tried it.
YOu can access the hidden menu by setting the network to Global or CDMA
Then enter 000000 as the SPC Code
The hidden menu is a little different than what we see on the net. It seems that the Droid 2 Global additional settings.
I went to choice 06 (Test Mode) and kept pressing next until it came to "Field Test Screen" and changed the service option from the default EVRC to EVRC-B which is suggested on the net for better call quality.
However, I wonder if this does any improvement for GSM users. To be able to access the hidden menu using the SPC Code 000000 I had to change the network to Global or CDMA. I am unable to use the same SPC code when the network is set to GSM.
I only wonder if GSM users need to set to something other than EVRC-B for better sound quality and also stronger network signal.
Anyway, after setting to EVRC-B I went back and changed the network to GSM/UMTS and the network signal still remains week. NOt sure about sound quality.