Siemens TC35

[savnik]

Check that pic pin 18 is connected to Max pin 12 and pic pin 19 is connected to max pin 11.

Since it seems you have a wired PCB then very likely you are unable to change the DB9 connection, so cross the serial cable

Al.

The pin 18 is connected to Max pin 11 and pic pin 19 is connected to max pin 12.
When connect the DB9 connection with hyperterminal and with those :
at
OK
at+creg?
+CREG: 0,1

OK
at+cmgf=1
OK
at+cmgs=xxxxxxxxxx
> hello my friend
+CMGS: 4

work very well.
When i connect to DB9 connection the pic don't work. I connect the pin 2,3,5 with pic pin 25,26 and ground (normal and cross)