@Anonymous User if the iPhone is already one of your devices, then pop on to chat they can free up the device slot for it. They won't increase it. The only option you have is to have accounts for separate passes, however this does have its risks so you do need to be careful and lock each with a payment pin. I noticed that you mentioned a previous post, yet none is showing against your name. What is the make up of your household?
Please take a moment to click thanks or marked as solution if this answered your question. I am a community contributor and pop on when I can.