GSM Advice Needed

Hi All
i am trying to add the capability of sms control to a project i did a few years ago.
i project was a Data logger which used the Pic18f452.
The Data logger is asleep all the time andits only wakes up when its time it take a reading
by a Ds1337 RTC on RBO_Interupt pin.
The problem is cant change the original design because its already on pcb but i do have some spear pins of the Pic brought out to a connector block just incase i was going to need them in furture they 5 pins including RB1 & RB2 interupt pins.
(RC6 & RC7 have already being used)
The Problem
=========
I have a wavecom GSM Modem that accepts AT commands from the serial port
Because the Data Logger is in sleep mode most of the time i would need another pic to
take control of the Gsm modem and when a valid command is received i can get this 2nd pic to use one of its pins to wake the data logger up on (RB1_Int pin)
then send the command to the data logger.
My question is > Is There a Better way of Doing this ?
Your responds in appreciated

Regards
Isaac

Isaac,
I like the 16f88 for things like this, as it has a hardware usart, so you can use Darrel's Instant Interrupts to keep an eye on your GSM modem, and it only costs a few dollars. Add a 20 Mhz crystal, and your good up to 115,000 baud.

Good Luck,

Jerry.