IPhone 4s will not let me text to one phone number

My iPhone 4s will not let me text to my brother's phone number.  It keeps giving the message "Error Invalid Number.  Please re-send using a valid 10 digit mobile number or valid short code."  I have rebooted my phone; same problem.  I checked the number; it is correct with area code and 7-digit number.  I have no trouble texting anyone else in my contact list.  The number is not blocked. 

I'd head to an Apple Retail Store or contact AppleCare at 1-800-275-2273

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