I have an Iphone 4 and someone I'm usally able to send text messages won't go through?

I have an Iphone 4 and someone I'm usally able to send text messages won't go through? - 1

Added (1). I have Imessage on but it's sending as SMS i also have Wi-Fi turned on Please Help I'M GETTING Really FUSTERATED!

Are you sending iMessages? If so make sure you are connected to Wi-Fi or Cellular, I recommend cellular.

Get a 5

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