I checked the Pandora account associated with your community profile, and I do see that it upgraded to Pandora Plus through Apple on your iPhone.
Can you tell me a little more about what is happening on your iPhone? Are you not receiving the subscription?
Keep in mind, Pandora accounts follow the email address, not the device. You can sign into the same Pandora account on any computer or supported device, as long as you use the same email address and Pandora password.