Again - if it is external content, you have no control over it. You are at the mercy of however the external site coded it. When you link to an external site, you completely lose control. The user might not even be able to get back to your content if the external site has blocked "back". Once you link to the external site, jQuery Mobile isn't even loaded any more (unless the site uses JQM itself, but then you will have THEIR copy of JQM loaded.)
I don't recommend ever linking to an external site within PhoneGap. Open it in the native browser, using "target="_blank". Then, if the external site allows scaling, the user can scale. If it doesn't they can't. The external site is what the external site is.
You can use a popup with the iframe option, but I haven't had much luck with that.
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