1. Try to contact again: redial your brother's phone number and see if you can re-establish contact. If the phone still doesn't work, you can try to send a short message or contact him through social media, email and other communication channels.
2. Give some time: Sometimes the phone may be disconnected due to signal problems or other technical reasons, so give some time and wait for the brother to reply voluntarily. It may be that there is something wrong with his mobile phone or there are other emergencies that make it impossible to reply immediately.
3. Seek other contact information: If you know his other contact information, such as family, friends or other emergency contacts, you can try to get news through them or get in touch with your brother.
4. Consider using a third party: If you can't contact your brother and things become urgent, you can consider seeking the help of other relatives and friends or people you trust to see if you can contact your brother or get some relevant information.
5. Handle with caution: When dealing with money problems, especially when you can't contact the other party, it is recommended to be cautious. Make sure you have all the relevant information, make careful decisions and avoid unnecessary losses.
If there is no progress in the above steps, you may need to further evaluate the situation and take appropriate actions according to the actual situation, such as consulting legal professionals or seeking relevant advice.