My grandmother's primary method of communication is a cheap Android tablet. It unfortunately includes a preinstalled SMS app that upsells a VoIP SMS service. My grandmother gets extremely frustrated by accidently clicking the message icon and opening an upsell page. There's no way to uninstall the VoIP app.
So instead of giving up and buying a new tablet or paying for an unnecessary service, I hacked together a way to open WhatsApp instead.