> So why not stick to 629 unless there really is some other obvious
> advantage with some other microcontroller

As he says here

http://www.wrankl.de/SMST4PIC/SMST4PIC.html

"For an implementation of all the PC features of SMS Transceiver
the PIC 12F629 have not enough RAM"

But for his demonstration and small-scale implemetation, the 629
appears more than adequate, so go for it. I have details of a
project using the Nokia FBUS serial i/f and MAX232, probably
similar to Wolfgang's

I'd take issue with

"it seems to me that the Siemens modules (like MC35i / MC35i)
are one of the best"

I spent a lot of ultimately wasted time finding out that MC35
s/w was incomplete. AT commands missing, "funny" timing etc.
Wavecom were cheaper and worked better (for me at least)

> And yes this will be my first program and MC. I seriously think
> my ''LED lighting days'' have been long over
> 
> What do you all think? Thanks for all inputs.

> But he's got a few extra features on it which makes it that bit
> harder to understand his code (for me)

If you get stuck, just ask

For example, in the SMST4PIC.asm notes he writes

"There is no conversion from small letters to capital letters. This
means, that all commands and answers to and from the mobile
phone must be in capital letters"

I found this unacceptable and inconvenient in my project, and
one of the first routines witten was a case convertor, which just
makes life a little easier. TXT content (and other fields) has already
been extracted from the data retrieved from the modem, with a ^
added to the end

;Convert any lower-case characters to upper-case

lc2uc    lfsr    fsr0,string  ;TXT source in RAM
         clrf    sms_len      ;message length

cloop    movlw   "^"          ;test for end-of-string terminator
         xorwf   indf0,w
         bz      break_down    ;yes, interpret TXT parts
         movfw   indf0        ;no, get character
         addlw   .255-"z"     ;test if UC letter
         addlw   ("z"-"a")+1
         bnc     nextc        ;not letter         
         movlw   0xe0         ;LC letter, subtract 0x20 -> UC
         addwf   indf0        ;replace original
nextc    incf    fsr0l        ;increment indices
         incf    sms_len
         bra     cloop

break_down .....

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