Can't send text from MacBook Pro
I am sending text from my MacBook Pro to others and some do have iPhones and some dont. Often it rejects. What do i need to do
Your Mac is not capable of independently sending or receiving SMS cellular text messages.
However, you may use your iPhone in conjunction with your Mac to accomplish this.
See "SMS and MMS" here:
Use Continuity to connect your Mac, iPhone, iPad, iPod touch, and Apple Watch - Apple Support