Why is my iPhone 4S not allowing me to FaceTime or iMessage?

I have about five people who have an iPhone on my contacts. My phone will not let me send and iMessage or FaceTime them! What's wrong with it? I'm getting annoyed because I have FaceTimed and iMessaged last week and both stoped working Saturday. The only thing my phone sends are text messages. Can anyone explain why?

No issues for me, maybe something with your carrier? Occasionally imsg can be down where it just sends as regulard text, but I haven't noticed any issues on mine.

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