Mass SMS Sending

Would like information and program to do the following: Send a small text as an SMS to all subscribers who sign up to my service. It needs to have capabilities to send 250,000+, although this number probably will never be reached. I need a program for me to select a txt file (which has all of the subscribers' phone numbers) and then a box for me to type in a message. When I send the message, it needs to be able to send SMS messages to all US cell-phone carriers. I have no idea how this is done. Sending of the messages needs to be fairly quick. I prefer coding be done in Visual Basic 6, although C++ and other programs are acceptable as well. With your bid, please provide the following: 1)Acknowledgement that you understand the project 2)Detailed explanation on how you plan on having it send the messages (contact the different service providers) 3)What language you prefer to make this in, plus any other information Thanks, and happy bidding! ## Deliverables Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. Complete copyrights to all work purchased. ## Platform WIndows 98,XP