Finding information to know about the watch
Information so finding out that I cannot send messages on iPhone anything to do about the watch without the having the watch just having Iwatch added and downloaded to my iPhone 6s
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Hi
Follow the instructions here, including contacting Apple Support via the link in the article if necessary:
If you can't send or receive messages on your iPhone, iPad, or iPod touch - Apple Support
Having an Apple Watch and/or having the Watch app installed on your iPhone does not affect your ability to send and receive messages on your iPhone.