ATT Wireless has a 10 number group message limit!
Welcome to 1995. I just discovered ATT has a 10 number group message limit. Yep, you only get to have 10 friends, family, co-workers, etc. You must vote the rest off the island. Yes, it's actually 2017. Bad ATT, bad dog. https://forums.att.com/t5/Data-Messaging-Features-Internet/Group-Texting-Limit/m-p/5307098#M87061