In this article, we will provide you with a comprehensive walkthrough on how to upgrade your AT&T line to the coveted iPhone 15 through Costco, ensuring you score the best deals available. We owe a special thanks to Reddit user u/ooaoo0000 for inspiring this guide with their original post on Reddit. So, let's dive right in and uncover the secrets to maximizing your savings while enjoying the latest iPhone model!

Step 1: Visit Costco.com and Navigate to Electronics > Cell Phones > Shop AT&T.

Start by heading to Costco's official website and navigate to the Electronics section. From there, click on the Cell Phones category and select "Shop AT&T" to access the exclusive deals offered through AT&T at Costco.

Step 2: Choose the Upgrade Deal and Select Your Desired iPhone 15 Model

Once you're on the Shop AT&T page, locate and click on the upgrade your line deal. Next, select the iPhone 15 model you desire, such as the impressive iPhone 15 Pro, to proceed with the upgrade process.

Step 3: Pre-Order and Log in to Your AT&T Account

After selecting your preferred iPhone 15 model, click on the "Pre-Order" button. On the following page, choose the option to upgrade a device and proceed to log in to your AT&T account for a seamless upgrade experience.

Step 4: Select the Line for Upgrade and Provide Trade-In Device Details

Once you're logged in, carefully choose the specific line on your AT&T account that you wish to upgrade to the iPhone 15. Take this opportunity to provide the necessary details about your trade-in device to maximize the value of your upgrade.

Step 5: Review Your Order and Confirm Promos and Offers

Upon completing the previous steps, you'll be taken to the order review page. It is crucial to double-check that all the applicable promos and offers, including the exclusive Costco deals, have been properly applied to your order. Take your time to ensure everything looks good before proceeding.

Step 6: Submit Your Order and Secure Your Costco iPhone 15 Upgrade

Once you've confirmed that all the details are accurate and the promotions have been successfully applied, click on the "Submit Order" button to finalize your upgrade. Congratulations! You've successfully ordered your iPhone 15 through AT&T at Costco, taking advantage of their incredible deals.

By following this comprehensive walkthrough, you can confidently navigate the process of upgrading your AT&T line to the iPhone 15 through Costco. Remember to act quickly to secure the Costco-exclusive offers while they last. Happy shopping and enjoy your brand-new iPhone 15!