What would you like added to your iPhone or other smartphone device?

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I would like a smartphone that I could have two phone numbers on.  I currently carry two phones – a Fox phone and a personal phone.  I would prefer to carry one phone with both my personal and Fox number on it.  (Yes, I know, I can forward one phone number to the other device but I would prefer the two separate lines on one phone.)

Do you have any suggestions how to improve your smartphone (assuming you have one)?