Comment by schvenk

To clarify: I'm not suggesting you trust Telegram more than mobile providers--if SMS were encrypted in transit I'd have a much weaker case against it. But the point is, with Telegram you're placing trust in Telegram. With SMS you're placing trust in your mobile provider, AND your friends' mobile providers, AND an unknown collection of other entities. At a minimum, that's a lot more points of weakness, even if each individual one is equally trustworthy.