In my Yeshiva we have a number of texting services. For instance, there is a zmanim text service for weekly Shabbos schedules as well as changes to the regular schedule. For instance, sometimes the weekly shmuess will go overtime into the lunch break, in which case Mincha and Afternoon Seder will start later that day. There is someone who will send a mass text message that says “Mincha is at 2:53” or something. He also sends a text every Friday morning with the times of Mincha, Hadlaka Neiros, etc. I find this very useful on Friday afternoon to be able to look up what time Shabbos starts on my text message rather than having to find a calendar.
There is also a text service where someone sends messages informing people of simchas as well as the time and place of Vorts, Shalom Zachors, Shivas, etc. This is useful besides for just being informed of the simcha which itself is nice, you can keep the text message and check it later to get the address, etc. (of course you can’t check the message on Shabbos for address of Shalom Zachar so you will have to revert to old fashioned pen/paper or memory for that one)