Apple wants you to ditch your old iPhone with new payment plan

The trade-in program pays you up to \\$350 for your old iPhone. Apple even started accepting damaged iPhones for trade-in earlier this year.

The iPhone Upgrade program, meanwhile, lets you get the latest iPhone, along with the AppleCare+ service, each year by shelling out a monthly payment for 24 months. The rate starts at \\$32.41 a month for a 16GB iPhone 6S and goes as high as \\$44.91 for the 128GB iPhone 6S Plus. When the year is up and a new iPhone is out, you simply take your older device to an Apple Store, trade it in for the new model and resume monthly installments.

Yes, it is complicated.

Apple said its new Trade Up With Installments program is geared toward people who have older-generation iPhones. And there are plenty of such people. About 42 percent of currently active iPhones are 2013's iPhone 5S or an older model, according to data tracker Fiksu. For Apple, getting people to upgrade to its newest devices is key to keeping its growth going.

The company sold a record number of iPhones in the quarter that ended in December, but unit sales posted their slowest growth rate since the Apple smartphone hit the market in 2007. What's worse, Apple predicts that iPhone unit sales will fall for the first time ever in the current quarter.

Not everyone needs the latest and greatest phone, and it can be pricey to get a new iPhone. The Trade Up With Installments program lets you pay off a new phone little by little instead of facing a big expense up front. It also lets you decide which model you want, rather than needing to purchase the latest device if you want to pay in installments, as with the iPhone Upgrade Program.

There aren't hidden fees or interest charged in the program, Apple said, and it doesn't include AppleCare+. The price equates to the amount of the new phone, minus the value of your trade-in device, all divided by 24. If you want that iPhone AppleCare+ insurance, you'll have to pay \\$99 to \\$129 up front when you get your new phone.

Whatever phone you purchase will be unlocked, which means you're not tied to a specific carrier. You'll still need to sign up for wireless service for the iPhone.

Unlike with the iPhone Upgrade program, you can't trade in your phone every year for the latest model. You would have to pay off your remaining installments instead of making a trade as with Apple's upgrade plan.