I got stuck with this project as the SMS frame for Nokia 5070 is not published and even gnokii will not know how to handle it.
I was thinking about downloading the nokia suite, log the com port and try to figure out the frame differences, but I have
not had the time to do so...
On the other hand, if the phone is supported by gnokii, it is possible to make it work.
I did develop a library of c functions to set up the frame, including the generation of checksums and 7 bit coding.
Regards