About a month ago my friend stopped receiving my texts and if she sent me a text I also did not receive it yet both of our phones says the texts went out. When I was with her I called her and I can hear ringing but her phone was showing no indication of a call coming through. She tried calling me and my phone did the same thing. We have not blocked each other, We use to talk just fine and then all of a sudden we can no longer send or receive sms or calls to each other. We have no problem texting or calling anyone else, just each other. I have a samsung galaxy s4 and she has a samsung galaxy s3. I am with verizon and her carrier is straighttalk.