Why can't she receive my text messages?

So this girl I know told me to text her… We both have iPhones I'm guessing because she asked me of I had one. Mine is go phoned from AT&T and hers is from Verizon. When I text her she never reviews my messages and when she texts me I never receive hers. But I can text anyone but her. Anyone have an idea of what's wrong?

The same thing happened to me any my boyfriend. He had metro pcs, I have boost mobile. You have to dial 1+area code+#. You must dial entire #, even the 1.So just save her number in your phone with 1+(area) and #.

  • Why don't I receive alerts or a notification when I receive a text and I already checked my settings? I adjusted my setting and even put the ringer and notifications on and put the volume and ringer on and I receive no alert, no pop up, alert or notification when someone texts me. Why? This is the iPhone X! I went to the cell phone/ carrier store and they didn't help me. They said to go to the apple store or check the settings. I already adjusted the settings. So what do I do now?
  • Why does my iphone5 receive text messages twice? When my iphone5 is on the lock screen and I receive text messages, unless I respond or look at it right away I will receive the same text message a minute later. Does this happen to everyone? How can I turn this off? It's very annoying!
  • Why does my iPhone receive messages late when I'm in a group text? I have the iPhone 4s with 16g (I have less than a gig left of space) and am on T-Mobile. Every single time I'm added to a new group text, my phone delays all messages sent to me. Regardless of whether it's another iPhone or if they're on the same carrier as me, none of my messages get to me until an hour or so later. Is it because I'm low on space? Or is it T-Mobile (probably the worst carrier I've ever had by the way)? Or is it the iPhone software?
  • Why do I receive text messages and missed calls on my old Iphone. How do I stop this? When someone calls me on my new phone, it shows up as "missed call from ___".It doesn't ring on my on my old phone, but after I answer the call on my new phone, it says missed call on the old phone, if that makes sense. I receive text messages from people on my old iphone as well. I use it as my iPod because it could drain the life out of my new phone, so I don't necessarily want to reset the entire phone. I have cellular data off and I'm with Verizon.