Apple's latest and greatest smartphone, the iPhone X, certainly isn't cheap. Thankfully, there are a few ways to save some serious cash, and a buying guide will help you do exactly that. Thankfully, all four major carriers are issuing special discounts and promotions to earn your business. Apple is letting loyal customers get a head start on the paperwork needed to trade in their old iPhones. As was the case with the pre-orders of the iPhone 8, members of Apple’s upgrade program will be able to submit their loan paperwork early, beginning October 23 for the iPhone X. Other mobile brands are offering monthly payments and discounts as well.