No idea.
Lots of pictures update:
I went to sears and bought a T6 pocket 1 1/2 torque screwdriver and completley dissassembled my i415. The objective here is to take apart the phone so 1. I can access the power button and turn on the phone via an external power button (or trigger [car starting], or timer (restart phone every 15 min in case mologogo hangs or someone calls and interupts the prog)
Note that if you do this, you probably void your warenty and are responsible for any breaking of your tech
Phone dissassembled, first pic. Simply removed all 6 torque screws and cut the 2 wires going to the speaker phone:
http://img223.imageshack.us/img223/3693/10025232eh.jpg
What the keypad really looks like:
http://img223.imageshack.us/img223/2403/10025200cd.jpg
Backside of phone:
http://img223.imageshack.us/img223/631/10025245dt.jpg
Disconnected the LCD from the faceplate of the phone. It just prys right out.
http://img223.imageshack.us/img223/5989/10025256yx.jpg
Everything is still working:
http://img223.imageshack.us/img223/5495/10025262us.jpg
Pop the LCD off of its plastic mount. It looks like a plastic film is glued onto the bottom of the frame and the LCD itself with a weak adhesive, just work it free. On closer analysis, I think the film is reflective on the backside (reflecting the backlight onto the LCD)
http://img158.imageshack.us/img158/3334/10025284gq.jpg
It appears the white keypad layer is just a bunch of concave foil buttons, when you push them in they are concave in and bridge the gap for the circuit on the buttons. This peals right off.
http://img158.imageshack.us/img158/8797/10025319de.jpg
Can still start the phone with a screwdriver bridging the contacts.
http://img158.imageshack.us/img158/5684/10025324eb.jpg
It's crying because I aren't holding the simcard onto the surface, just the battery. However, this shows you could just solder the points for the battery and the sim onto the respective points on the phones board.
http://img158.imageshack.us/img158/3944/10025357lz.jpg
Another shot of progress so far. In this shot, I cut away the rest of the plastic lcd frame that wasn't connected to anything and was wasting space. Don't sisor the glued on circuit board!
http://img158.imageshack.us/img158/4745/10025365oq.jpg
Alright, that is all I am doing to the phone for now. Now for the construction of the data cable / car charger: I found a nextel charger for $1 at the local dollar store

so I figure I could but another one for trial and error (one from ebay is still arriving in the mail). Stripping its end like I did for the data cable reveals:
http://img275.imageshack.us/img275/2265/10025373ju.jpg
The points on pins 3 and 16 are large enough that even my uncordinated self could solder them to the data cable points. Result:
Throw on some black electrical tape:
http://img123.imageshack.us/img123/3337/10025396ej.jpg
Progress so far (with completed data cable in shot):
Ok now I have a few things left:
1. Figure out where and how to put LCD in the dashboard of the car
2. Have my better than me at sodering friend to make a external on/off button for the cell
3. Determine what components from the back of the phone I need.
Look at this:
http://img123.imageshack.us/img123/5626/10025410em.jpg
Obviousally the bottom 2 connectors are for the sim card and the battery. It is the rest I am interested in. I think the tiny wire in the upper right is for antena, and I am unsure of the other 2. The vibrate component is in the middle, but its 2 contacts dont appear to touch the corosponding contacts on the phone's circuit board. Perhaps that is what the contacts in the upper left do? Or perhaps that is for gps (but doesnt gps need 3 connections, one for RX, power, and ground)? Is the GPS on the circuit board?
Thoughts?