Hello, I have a K750i. I connected the phone on XP with hyperterminal. I had to choose the right COM port, but i can send AT commands and it response. I use your example and can send a sms trough hyperterminal. In computer management I see that there are a few com ports when installing the phone. I had to choose the right one in hyperterminal, otherwise it doesn't work.
I then tried to connect the K750i with arduino. But no result. How does the arduino now witch com port to choose on the phone?
I connected the usb cable to the arduino, except the red (5V) because it than want to charge the phone. I don't now if there is a converter of some kind in the usb cable. Maybe it's better to connect straight to the phone?
Thanks!