yes
What would be the purpose? An iPad for pictures maybe? Hmmm... to answer your question, Yes they are permitted in the ballpark.
Per the DBACKS website; ELECTRONIC DEVICES The use of cellular phones, tablets, hand-held radios, televisions and other electronic devices is permitted at Chase Field, providing they do not interfere with another guest's enjoyment of the game. The Arizona Diamondbacks reserve the right to ask any guest to discontinue the use of such devices.
Yes you can.
Why would you want to?
Yes, you can bring any wireless items ,the only things not allowed are guns, knifes sny type of weapon or any type of metal container, some people squeeze metal containers inside some times for water and such but they're not allowed, and if caught, one wil be told to put it in the car, you can bring any clear plastic container or a clear see through bag.
Thanks! Your answer is awaiting moderation.