>SMS on a rotary phone eh?  That'll be your most processing intensive
>portion of the PIC code.
>
>The GSM module will have fairly simple methods to send text SMS,
>similar to using a modem with AT command strings.  It's not difficult,
>read up on the module's command manual.

I remember very old BPO phones having a slide out tray at the bottom where 
you could fit a sheet of paper with often used numbers. You could possibly 
put a thin LCD and SMS keypad in there for when wanting to use it for 
messages. 

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