It seems as though the system update has messed up the data, text and call features on the phone. I'm not rooted, with that being said can the update be erased from the internal memory and then do a factory reset. I'm having the same issue as everyone in the forum in the link provided https://community.sprint.com/baw/mob...sions%2F155517
Sent from my 831C using xda app-developers app
Have you already tried dialing ##72786# from your phone dialer, then choosing reset from the menu when it pops up? If not, try it and see if it gets things working again, then update your profile and PRL. You can also do ##3282# but you'll need your MSL, which Sprint should give you if you ask for it. There isn't really a way to uninstall the software update since you're not rooted, at least not that I'm aware of.
For more info, take a look at the thread in the link below:
Some older devices still remain very popular. Phones like theHTC Desire, Sony Ericsson … more
23 Sep 2014
By Tomek Kondrat
XDA Developers was founded by developers, for developers. It is now a valuable resource for people who want to make the most of their mobile devices, from customizing the look and feel to adding new functionality. Are you a developer?