It’s important to remember that two decades ago, text messages cost 10 cents. Each. Back when we measured our cell phone plans in minutes, and when even 3G connections felt fast, text messages were a huge business for wireless carriers and a huge expense for anyone whose kids learned to T9-type just a little too quickly. Then BlackBerry, nearing the peak of its powers, did something remarkable: it cut the carriers out entirely. Before WhatsApp and Telegram, before iMessage and RCS, there…