490647 Mobile app

Hi, I need someone who can build me an iPhone app,later an Android and windows mobile app that does following things: -app checks data on a web server that is online all the time-> if it finds data on the server, then it downloads that data, and a new window pops up on the phone,that looks and rings exactly the same like SMS message. So, when I upload something to my server, I need this app that is on my phone to recognize that it has been uploaded, than, it has to download that, and when it does, it has to ring and popup a message with this downloaded data,and this message has to look like a SMS message and preview downloaded data to the phone user. Pop up has to have same ringtone set up and everything same like the SMS message on the mobile phone. Is this possible, if yes, how expensive would it be? Can you create both the app and the website where I could upload .txt files and .jpeg files that would the phone download? How much bandwith would the phone consume for pinging servers to see if there is new data to be downloaded? -If the first part is done correctly, I would need the programmer to do another thing. Based on the person's geolocation, the app should send info to the server where is the user currently located, and if user is in area xy than nothing happens, but as soon as user gets into area yz, and phone sends that location to the server, the server should in that case send back specific data on the phone, that would pop up like a SMS message,just like in the first case above. How much is this complicated and expensive for me? it's a small local project for a charity and I need it to be done in the next three months, but I am just not sure is it affordable, depending of the sum of the bandwith needed for operating this kind of app, and that is variable costs. What about your fixed costs for creating this apps and website with the interface to upload this .txt and .jpeg...? Thanks in advance,feel free to ask any questions!