IPhone 4S not sending SMS to one contact?

Me and my friend both have the iPhone 4S and we're on the same provider. I can receive all of her texts and I can send her iMessages, but when I try to send her a text, it doesn't send. I have tried deleting her and resetting it, i turned off my phone, I have the 10 digit number, there's seriously nothing I can do! (We're with Rogers by the way)

I wish I could help you but I'm having the same problem with my iPhone

  • Why is my Iphone not sending as Imessages and receiving iMessages from one person? I'm texting my wife and we both have iPhone's and she is getting the messages as an iMessage but the ones I'm sending her on my end show up at green. Sometime it will go as blue, get the little red exclamation point then send as regular SMS. I'm texting someone else too and she has an iPhone, and she is getting mine as regular iMessages and mine are sending as regular iMessages. Why aren't they sending to me wife as iMessages?
  • Problems sending SMS using iPhone? Have a question for iphone. Have any of you encountered the same SMS being sent multiple times to the same number (at the exact same time)? The recipient only received the msg once but when the bill comes, I'm charged for the same message about 4 times as their records show the message has been sent four times. Is it a phone software problem or a problem with the phone company's network? Would appreciate any input from you guys.
  • My photos are not sending in group messages, but are sending in individual messages? I'm with Straight Talk Wireless. At first my pictures were sending in the group message but now they are not. I don't know what's wrong, all my settings are what they are suppose to be, and I'm currently on an iPhone 5s IOS 8.4.
  • IPhone Sms Help, Regarding Copying SMS messsges? Ok, so with ios 7 being released soon, i was wondering, Is there And FULL >FREE< way of copying all my Sms messages off my iphone to myLaptop, i Really need to know as i have some really inmportant college and benifit information that i so far can't find a way of transfering it?