Hi J007T, when it comes to upgrading if you have the Sero Premium Plan to a Samsung Galaxy S3 or HTC EVO 4G LTE you can keep this plan the only thing that would change is that the $10.00 premium data charge will be added if it wasn't added already. Please do keep in mind to place orders under this plan you have to log on to www.sprint.com/everythingplus or visit a Sprint owned corporate retail store which you can locate here http://www.sprintstorelocator.com/locator
Sprint Social Media Team
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