Why do your friends care about the underlying transport?<p>I too think SMS transport should have been maintained, but I believe it only really matters when you&#x27;re stuck without mobile data access (for example, when I was on a cruise ship earlier this year I had roaming SMS&#x2F;voice but not data).<p>As long as you _do_ have mobile data access at both ends, then a message to another TextSecure user will be sent encrypted over the data connection; and a message to a non-TextSecure user wouldn&#x27;t have been encrypted anyhow.