I’m sorry I didn’t mean to imply that this was the halacha. Just what I thought. I am not a boki in hilchos sicha b’emtza hatefillah so I found a site called GoDaven with an article by a Rabbi Doniel Neustadt. He lists the halachos of talking during davening:
(4) During a scheduled prayer session one may not separate himself from the tzibbur and engage in idle talk.
(5) Talking during davening causes a chillul Hashem, since it unfortunately lends support to the widely held perception that non-Jews are more careful than Jews to maintain proper decorum in their house of worship.
(7) During certain portions of davening, talking is prohibited for additional reasons as well. Sometimes talking is considered a hefsek, an “interruption” which may invalidate the portion which is being interrupted, while at other times talking is prohibited because the congregation must give its undivided attention to that portion of the service.
The ones I skipped out weren’t relevant.
But you can see that the first two would apply to texting as well. And the last item is hefsek.
but I don’t know what the texting aspect adds to the question of what is hesach hadaas.
You’re right, texting is definitely being mesiah daas which is not relevant in davening. I don’t know what a good example of hefsek would be.