Only Borders and Kobo can read the mobile file format, which is a super secret format that Kobo uses to lock you into their store. Borders/Kobo apps are available for several types of smartphone. I don't know if Kobo and Borders apps inter-operate (i.e. whether the Borders app can read Kobo "mobile" files and whether the Kobo app can read Borders "mobile" files). If not, don't forget that Borders will be shrinking under bankruptcy and could disappear entirely within a year or two.
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