Question when receiving a call?

[tandtmah]

Hello All,
I feel dumb for asking this question but can anyone tell me how to do this?

When the phone is not asleep and I receive a call, I can choose to forward the call to voicemail or send the caller a text message.

When the phone is asleep and I receive a call, I can only slide to answer the call or set a reminder (?). Is there a way I can add the functionality to send an sms when I receive a call while the phone is asleep?

I've owned the iphone 4gs now for 3 years and I'm finally getting around to trying to figure out how to do this.

Thanks

 

[Applejuiced]

Dont feel bad, I was asking myself the same thing yesterday.
Im still not sure how to send a text when i cant answer and talk to the caller while the phone is locked.