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.

Try turning it off and back on. And then turn airplane mode on for a minute and back off

Either:
1. Their parents may have blocked texting past a certain time on their phone.
2. Their service

My iphone 4s will not send text messages to certain numbers and it seems to be almost everyone who has an android phone but I can receive messages from them?

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