Sms messages won't go through to one person?
I own a Galaxy S4 and I recently (just like 2 days ago) started experiencing a problem where one contact, and only one contact on my contacts list isn't getting my messages. She can send me them, but when I send her some, it says they went through but she isn't getting them. This starting happening when I started using Google Hangouts as my SMS app (2.0.2 or whatever the most recent update is). I don't know if that is related, but it seems like ever since, she can't get my messages. So I switched back to my regular default texting app, and of course that doesn't work either. I've uninstalled hangouts, and I've cleared it's cache and turned it off and everything you could imagine. I don't understand why my messages aren't going through. Also, this might or might not be relevant, but it's a replacement AT&T sent me after my last one broke. Though that wouldn't explain why I was able to text her before hangouts or why I am able to still text like everyone else. If anyone could offer any help, I would really appreciate it, because I am lost and this is starting to become a big problem. Thank you.