How to open international roaming voice, short message and data with mobile phone?

Dear Tianyi customers: You can write short messages "KTGJMY 1" or "6372 1" on your mobile phone and send them to "1000 1" to enable international roaming voice, short messages and data (all of which are enabled). Thank you for your use. Thank you for your interest in telecom products. I wish you a happy life. If the above information can't solve your problem, you can also log in to Guangdong Telecom Mobile Mall () to seek help from online customer service, which is available 7X24 hours a day!