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I am looking to have a custom app created that will allow me to create custom apps for my customers and also be able to do GPS tracking in real time. I need to be able to send a custom message when a person is in close proximity to one of my customers businesses. I need to have the flexibility to change the proximity distances and also be able to create a custom hotspot with an offer for each customer on my list. This app needs to work with as many cell phone types as possible.