[all] confirmation sms

[Vikas Saurabh]

> This might help :
> http://www.iphonestalk.com/tip-how-to-get-sms-delivery-reports-on-an-iphone/
>
> No known code for french network here... I would have think it is not
> so hard to find since a lot of phones have this feature implemented...
> but a quick googling gave me nothing.

exclamation (!) works on Airtel, India.

Although, the phone hardly knows what the received message is about
and hence the receipt comes into the inbox rather than storing some
kind of information to the original message.
Nonetheless, the information can be used for emergencies :).

--Vikas