The most hotly anticipated smartphone duo of the year is about to go from rumor to reality and the biggest question on Apple’s fans’ minds will shift from “what will the new iPhone 6 be like?” to “how much will the new iPhone 6 cost me?” Months worth of leaks and rumors have already answered the first question, for the most part, but it’s up to you to answer the second one; the price of the new iPhone models will depend on a number of factors, not the least of which is your current upgrade eligibility status with your carrier.

Here’s how to check to see if you’re eligible for an upgrade with each of the four major nationwide wireless carriers in the U.S.