Text message appears as Chinese Symbols in AT&T When I send a text with letters (in English) and Emoji's to a friend from my Galaxy S5,  she receives text that looks all Chinese. She has a Galaxy S7 and we are both on AT&amp;T
Your network APN settings are messed up somehow. AT&amp;T can assist you with fixing it but I had to change the mine to add admin into the string. It's worth noting it's happening on large messages. It just so happens emojis bloat the send size.