Something that should not affect more than a few or none on Swedroid is that WhatsApp now requires Android 4.0.3 or later. Ice Cream Sandwich arrived back in 2011, so the app’s backwards compatibility is still pretty generous.
WhatsApp can also run on models with Android 2.3.7, but only until the first of February. In the same vein, WhatsApp stops supporting Windows for phones. The app completely stopped working on Microsoft’s abandoned operating system yesterday.