I read about this some time ago and didn’t think much of it until I experienced it.
I have sipdroid installed on my Optus PrePaid Samsung Galaxy Gio. It works very well.
A family member got the same handset as me and asked me to configure it. Strange. There is no sipdroid in the market when browsed on the phone. When browsed on the PC it says that sipdroid isn’t compatible with my handset so there is no option to install it.
Uhh, I do know its compatible. WTF?