It looks like you are wishing to switch carriers and purchase 3 new iPhones. I have created a search results page of three new iPhone 6 16 GB devices and all the available payment options and plans associated with these devices!
I have also created a list of carriers that might be beneficial to you from that list. These two carriers offer high-speed 4G LTE data, reliable coverage and best of all affordable plans and phones.
Remember choosing different ways to pay like through monthly installments, early upgrade or lease will make that expensive upfront cost affordable! You can select different ways to pay between the list of carriers and the image of the device.