2 ms·Have we proven that? SMS is still the only surefire messaging system, despite the flaws.by jayd16 5y agoHave we proven that? SMS is still the only surefire messaging system, despite the flaws.deadmutex 5y agoI see what you did there :Pdjrogers 5y agoNo, it really isn't a 'surefire' messaging system if it doesn't work on any device without a SIM card and a carrier subscription...