I am unable to send text messages to one contact. Not sure about every single one, but some I can text sometimes I would have to re send it when it asks. I can receive text messages and can call the contact. I tried deleting everything including the contact and messages and tried texting just the number, but it would say, "Send failed. Would you like to retry?" about 3 times then say, "Message is not delivered: Service not available" I was able to text everyone without a problem, until about an hour ago. Then I couldn't text this one person I text the most and others it says, "Send failed. Would you like to retry?" and it would go through when I say yes. I need help as soon as I can get it thanks.
