finally, after upgrading my Nokia E71 with new firmware (210.21.006), all features that should work from the start, it is work now.
so, my previous post about Nokia E71 can be ignored now.
anyway, to be able to install unsigned apps for Symbian, I got some tricks here:
1. get Symbian Publisher Key, the tricks is here.
2. get Sign the unsigned apps, the tips is here.
