A:AnswerSony controls both sides of the connection.
The device doesn’t have any competing background connections that could degrade your experience on a phone.
A:AnswerYou should be able to. The Portal does not save or process any actual game data locally, it streams from your PS5. Any saving or game data altering is being done on the PS5, not the Portal.
A:AnswerThey will never answer this question. I literally successfully added the item to my cart only for it to disappear and say unavailable. I had to complain to customer service for them to allow me to have it shipped in 3 weeks. It's sad.