SMS Alert System

I am looking for a sms alert system for our few web portals. the example sites are [login to view URL] or [login to view URL] So the user signs up and get the required information which match his needs to his mobile. The system must work for mobile users in Bangladesh, USA, Canada and Europe. The system must be designed to limit the usage of text messages sent by specific numbers everyday basis. Or have an acess control list so we can control how many sms's a specific numbers will be allowed to send. The programmer must make sure everything will be fully functional before we send the payment. If you have any more questions please do not hesitate to contact me.