I want to apply for foreign roaming service. How to receive short messages?

When using a mobile phone to roam abroad, you need to open an international roaming service in the business hall and deposit a certain telephone deposit before you can use the international roaming service abroad, answer calls and send and receive short messages with your mobile phone. When roaming internationally, the charges are different according to the country where roaming is located and the country where the SMS number is received when sending SMS. When roaming internationally, receiving SMS is free (excluding MMS).