My iPhone 5c won't send messages to one person. WHY?

I will send a message a it shows blue for an iMessage and even that it was delivered but the person i sent it to never actually gets it. I'm not sure how to fix this and could use some help!

Are you sure you are sending it to the right number? Do you have them blocked by accident on your phone settings? Also, try deleting their contact, and putting it back in. ALso try using the 1-000-0000. So the 1 before the area code when entering the number. Also

I don't know. I'm texting someone and its not working! What is going on!

  • Why won't one person get my text messages So I can text everyone except one user I have an iPhone with verizon and she has a iPhone with Verizon and she tells me she texts me but I don't get them and she doesn't receive mines either we get them sometimes not all the times it's bothering me not talking to her i don't know if its my phone or her phone or it's Verizon's network is anyone have problems with this?
  • Why won't my iphone 4 send text messages to one of my contacts? My iphone 4 is in perfect working condition and it successfully receives and sends text messages to all my contacts except for one. I had been texting that one contact all day, but around midnight, my phone kept saying, "messge send failure" with a little "!" beside the text every time i tried to reply. Why is this? It's been around fifteen hours and it still won't allow me to send messages to that one contact.
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  • Messages won't send to one number? I have an iphone and i've been texting an android. It was all fine until my messages won't send. I sent a message to another android user & it went through like normal. But everytime i text the other person it says "message failed" & i try to send it again but it won't go through. Did they block me? Or is the phone dead?