PDA

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I know PDA's are old technology compared to the technology of today and you can find the same applications on any smart phone. But I have been thinking that it would help to keep some space open on my iphone. I thought that it might help with with keeping some battery charged when I am out and about. I like having some battery juice just in case if there is a reason I might have to call for help or if something came up and I needed to make a phone call or send out a text. Am I strange in having one?