Trouble sending messages iPhone to andorid?

I have an iPhone and I can send an iMessage to someone and I even sent a text to an android phone and it went through but I try to send a text to another android phone and it says not delivered, could this be because he blocked me? Or his phone service was cut off? Or what? My text to another android phone went through fine and also iMessages are… Any help would be great thanks!

IMessage is only used for communicating to other apple devices, it my have glitched or something that is why it sent it.

Probably an issue with your carrier or his. Imessage can use either Wi-Fi or celltower, so it could be routing around your carrier, while the normal text has to go through the carrier.

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