I think if you are starting on this journey, there may be some utility to a tool like text messaging that can help make the necessary life changes routine. But after about three months, this stuff becomes habitual. And our lives are not conducive to timed reminders. I already have an alarm to wake me in the morning, I don't need another. And my days (like most) are not filled with a fixed schedule. I eat when I choose. I exercise when I choose. To have a text message on some fixed timetable is of no use.
I will tell you what would be of use. An alarm feature that reminds me that 2 hours have passed since my meal bolus and that I need to test my postprandials. I don't understand why this is not a standard feature in pumps. But it is hard to see how a text service make possible without having specific knowledge about when I bolused or corrected.
Perhaps a newly diagnosed T1 would like some alarms with reminders. But after about three months, you really should have made all this stuff a habit. And at that point, if you just get a whole ream of messages, all of which are ill-timed and irritating, that isn't going to help.