Code for Gas Sensor Alert Based on SMS

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can me? please refer code in attachment.
i'm using arduino uno, sim900 module, mq2 gas sensor , buzzer create gas sensor detector based on sms.
i have 2 option :
1. mq2 gas sensor detects , send result via sms number set in code.
2. can send specific string know surrounding gas percentage , send result specific number set in code.

but want change second option auto reply incoming number. should do?

what for?
clearly interested in detecting flammable gas, why making this?
i ask because in code, way reading sensor , mapping ie:val =  map(val,0,1023,0,100);, not in way give results percentage of flammable gas.
so if intending use in life-safety application whatsoever, proposing dangerous.


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