confused. 480 1234567TYPE group messaged with the other number being 4801234567

ok so my guy keeps messaging his friend under one number his friends owns a business when I used true caller it showed up as a group message with the number that was texted and the number that was texted with the word TYPE at the end of the number also showed up as the business when I look it up but I don't understand how the guy is in a group with his self and his business number with TYPE at the end? what is my man trying to do here?