Why my iMessage keep on sending as a text message when i already activate my iMessage?

[iMore Question]

Is it because the recipient has no data or wifi ?

 

[Just_Me_D]

1. The recipient does not have an iOS or Mac.
2. The recipient's iOS device could be off
3. The recipient's iOS device may be having cellular data issues.
4. The recipient may not have iMessage enabled on his or her device.