Calls failing on iPhone despite successful texting

I used my phone this morning, during that call it got dropped. When I tried to call back it "FAILED"

I tried a few different numbers to call same thing. I can text, I texted my daughter she said she tried

to call me several times they did not come thru and her phone said failed call. She has a different

carrier than I do. Some with someone else texted to try to call me, failled call, in and out ??

[Re-Titled by Moderator]

Original Title: All calls "FAIL"