I used Zagg on my old iPhone as well. I never had any issues using the touchscreen, including scrolling, with the Zagg on it. Last week or so, I took the Zagg off just for grins and the screen looked the same way it did when I bought it. And there was no residue.
When I got the new iPhone, I bought an otterbox defender. I occasionally have issues with "the dropsies" and wanted to make sure Siri, I mean the phone, was protected. It has a screen protector built into it so I have no need for other screen protectors. And I got mine on Amazon. Their prices are generally way better than what you find on otterbox's website, depending on which one you're looking at.
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