TU, I'm on it. Edit.. Actually, already I'm getting short codes, which I haven't been able to get in a long time! Back to Amazon shopping as I can now access my account because of thisIt's in the reset section of settings. There's a "factory reset" option, which will destroy your data, and a "network reset" option. Which will reset everything networking related, but not destroy your data. Although you will have to reenter your WiFi network, and maybe APN (but usually not).
This is the default fix for lots of networking issues. So you'll want to figure this out.