Q: iphone trade in

Hello gmd5137,

Thank you for using Apple Support Communities. 

I understand from your post that you would like to know if your monthly payments for your new iPhone 7 will be lowered when you turn-in your current iPhone. When you upgrade through the iPhone Upgrade Program you will trade-in your old iPhone and start a new plan. At the bottom of the following article, there is a section called, "Questions About Upgrading" that will provide you with more information: 

iPhone Upgrade Program

With the iPhone Upgrade Program, you can spread the cost of iPhone over 24 months. But you can also upgrade to a new iPhone after just six months, if you’ve made at least 12 payments. Just trade in your current iPhone and start a new plan. It’s that easy.

Also,

Can I trade in my current device? 

Yes. If you sign up for the iPhone Upgrade Program in an Apple Store, the trade-in credit will be applied to your credit card. If you sign up online, you will receive a gift card after a short time.3

3. Offer only available on presentation of a valid, government-issued photo ID. You must be at least 18 years old. Value of your current device may be applied toward purchase of a new Apple device. Trade-in values may vary based on the condition and model of your smartphone trade-in. Offer may not be available in all stores and not all devices are eligible for credit. To see if your device is eligible, please visit Apple’s approved partner for the trade-in and recycling of eligible devices. Some stores may have additional requirements. You will be required to agree to the full terms and conditions available at the Apple Store. Online and in-store values may vary. Apple reserves the right to refuse or limit the quantity of any device for any reason.

Best Regards