How do I place an upgrade order for a phone using Sprint Relay? To upgrade your phone, go to www.sprintrelaystore.com and select View products. To determine if you’re eligible for an upgrade, click Check your upgrade eligibility, enter your last name and phone number, and click Check eligibility. If you are eligible click Continue shopping. Select the type of phone you want to upgrade to and add it to your cart. Click the Add to Order button. You’ll see the Sprint Relay Data Only Plan and the cost per month for that phone. Select the plan. Select additional options if you want any and click Continue. During the check-out process, you can choose a protection plan, accessories, and plan upgrades. Review the shipping and activation fees and then click Continue to check out.