Are the letters involved in texting case-sensitive?

Letters involved in sending short messages are not case-sensitive. The above information is for reference only. Guangxi Telecom's worry-free card costs only five yuan a month, and the traffic charges step by step. The more you use it, the cheaper it is. For details, please visit the online business hall of Guangxi Telecom. Customer service on the 24th will answer your questions. /UrlDispenseApp/index.php