Iphone 6 my test messages are not going through to Android phones. How do I correct it? Thank you

[iMore Question]

When I send text message to an Android phone me text message are not going through.

 

[katesbb]

When I send text message to an Android phone me text message are not going through.

Did the Android owner recently switch to Android from an iPhone? If so: https://support.apple.com/en-us/HT204270