When I start a group chat by starting a text and adding contacts to the "to" section, it only allows me to put in 10. Is there a way I can add more people? Also, when I'm in that chat and I go to details, I can't add or remove people from the chat either (There is no option).
iPhone 5s, iOS 9.0.2
Send a group message with your iPhone, iPad, or iPod touch - Apple Support
you can only add/remove people from the group if all users have Apple products so it is in imessage.
sounds like you have user who are not iphone users, so you won't be able to remove/add and the set limitation for adding user to a group text is set by your phone carrier, contact them and see what they can do for you.
Send a group message with your iPhone, iPad, or iPod touch - Apple Support
you can only add/remove people from the group if all users have Apple products so it is in imessage.
sounds like you have user who are not iphone users, so you won't be able to remove/add and the set limitation for adding user to a group text is set by your phone carrier, contact them and see what they can do for you.
I am unable to add more than 10 people to a group chat
