I quite like the idea of people being able to start my car by phoning me up!

“Hey you coming to Joey’s house? I already started your car ;)”

Hey this is cool. I love that the Audio port is TTL. We are working on a universal way to do this for Open smart phones. What we are using now is an op-amp to translate 1.2v of the droid to 5v. Would love to get some help finding a good mosfet circuit to do 1.2v level translation.

http://www.flakelabs.com/index.php/2010/01/jack-video-uploaded/

@ robby, no not from my experience.

I have been working on a high altitude UAV glider for quite some time now, unfortunately I’ve had to stop due to short funds. This is the exact phone that I used for ground communication (under 10kft)

http://www.addictronics.com/projects/high-altitude-uav-glider

@inventorjack

Exactly. :) A hiatus more than a true cease in production. Also every time I work on it I find something new that has come out that would work better than what I have. The only think I don’t think that I will ever be replacing is the GPS since it was made before the >60,000 ft ban several years ago, so it will work up to my intended 100,000 ft.

@Robby: No, you see exactly the same pieces of memory as the normal phone interface sees, there’s no hidden log of messages.

I bought one these as an emergency phone because it was the cheapest option ($20 for the phone, $15 for minutes, $10 mail-in rebate after) and later saw this online:
http://code.google.com/p/sserial2mobile/wiki/MotorolaC168i

After toying with from a terminal and the FTDI USB ttl break-out cable, I found it quite annoying to deal with. The phone’s CPU is rather challenged w/ normal moment-to-moment issues and often misses incoming characters, which means that a microcontroller would have to do a LOT of feed-back checking to ensure it’s commands actually go through. (As I recall, I know you can have it just spit out when a phone call or text arrives, but I don’t think it’ll spit out the body of the text message, only the sender)

For anyone interested in working with one of these, be sure to read through the AT command list for the G24 which is what you’re really talking to:
G24-Lite: http://harvestelectronics.com/harvest/pdf/g24-l_at_commands_final_091007.pdf
G24: http://harvestelectronics.com/harvest/pdf/g24%20at%20commands.old.pdf

I have been doing for almost 4 years.
I used some old Siemens cellphones like the A56 and my old M55.
what I did was use a cable RS232 to TTL.
to normalize the signals I used an HEX inverter between the cable and the phone.
what I did was a application to execute shell commands sent on SMS.
To read the SMS from the cellphone I used GAMMU to talk with the phone and my main code was made on TCL and all that under Linux.
It was a small University project.
If you find it interesting or need more info please feel free to contact me

siemens M55 (M56 in U?S) was a great phone. my brother and i both had one in high school and i bought a couple more on ebay and kept Franken-phone-ing them together every time one of them broke ( we were really rough on them) i lost one for a few months and when i found it in the ground, with mud all over its chips..
it didnt work. so i had to franken-phone it together to recover my data.
i use to text all day long, never having to look at what i was typing. i wish someone would make a phone that cool with modern-technology (although COLOR LCD was top-of the line back then)
i didn have any trouble getting it to run all kinds of java programs. nowadays you have to use the master key and operator code. but the lights, they were fun to bust out at a club, or a concert, or when you’re in the dark and someone is rollin’

Most windows mobile phones have hidden com port on usb pins, and it very handy as pocket terminal with full physical keyboard

It is true, data pin protections can only work in the phone system The pin software only disables opening the message by asking a pin before opening a message but the message itself is not encrypted.