Press the green key and you will see the word CTRL in green on the screen. Then you press 7, 8 or 9 until you see a letter J for Joystick. Press Green again. This procedure tells SDL that you want to use the nokia cursor joystick.
Now press the hash key until you see a picture of a mouse on the screen. This tells the emulator that you want to enable mouse mode.
Mouse can then be controlled using the 6110 cursor joystick. You can increase the speed of it from the uae4all menu.
I have the same phone as you, the problem I have is that when I have the joystick enabled (in emulation) the fire button doesnt seem to work.
Fire and mouse buttons are supposed to be left and right blue buttons. In mouse mode they work but not in joystick mode.
Please let me know how you go.