will it be possible to build a low cost hardware/software device which can capture mobile numbers within a specified radius and then use that information to transmit an sms to those numbers? From what I've read online, the actual phone numbers are encrypted. What if we could simply capture the unique mobile identity information and use that to transmit the sms? We do not want the mobile numbers or any other information.
Just want a hardware/software combo which gives us ability to send sms to all mobiles within specified radius.