make Application

I want to make to send. Bulk sms an app Briefly outlined: - I organize events and often do mailings via mail and occasionally via SMS - I now use a system / platform where I personalized messages (best Jan, etc etc) send mail in form to a platform, and there are those emails then converted to an SMS. Works fine, just a cost per SMS. - The advantage is that bv 1000 all text messages are sent very quickly, but that's not a must for me, it would be fine, if that spread smoothly. - Sometimes that for mailings to small groups, but sometimes hundreds or thousands. - Since mobile providers exist that offer unlimited text I could send one by one, of course via mobile phone messages because there are no costs. - What I am saying is a way through an app (or other tool), so using to send my phone, a whole slew of personalized text messages. - Firstly, for their own use, but why not suddenly built so that others can use. - I have already found app to send one message to a group identical. But what I want is unique messages, the personalization so, send it to number by number.