Android App + Custom Web Script

I have a list of optin phone numbers which I contact them every week in regards to their next meeting time and location. I want an application hosted on my VPS server where I can login, enter my sms message, upload a csv file with a list of my optin phone numbers and hit send. Then I have 4 android phones connected via wifi running a custom app that you create which basically downloads the sms data from my VPS and then relays the sms through the phones cellular data connection to the phone company. Also the VPS & android app should be able to distribute the load upon the 4 phones that I will have running, for example say I upload 80 contacts, and have 4 phones, each phone should get about 20 sms to send which basically makes the sending speed faster. It's very ideal for you to own a android phone when building and testing this application, please note in your bid if you have a android phone.