Couldn’t that blow up your phone? I could cat a million line file and it would take some time before I could do the equivalent of ctrl-c or close session.
Yes, for example, just update the screen no more than once every few seconds. With no compression you can send chained 153 ascii character messages is only 13-14 SMS messages. With any compression, I suspect you could get refresh rates for most commands in less than a second in response to reasonable commands. Unreasonable command responses you could simply ^C or otherwise terminate the script.