AT&T has implemented a limit to the number of group message participants as a way to protect our customers from spam and/or malicious software. AT&T is vigilant about protecting you, our customers, from unsolicited text message spam. We are evaluating options for supporting larger group limits in the future. At this time, we do not have any information on if or when a change will take place. Let us know if you have any further questions or concerns.
Sean, AT&T Community Specialist
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This is crap, other cell phone carriers allow more than 10. Why us Att behind the curve on this. I habe read a lot of complaints from ATT customers on this. I myself need to text multiple people at once and its a pain in the rear end to send four different text with the same information in it because my my carrier AT&T supposedly the BEST can not accommodate more than 10 because of SPAM. Seriously that's a load of crap. Come on AT&T do the right thing make your customers happy.