How did group SMS become MMS? Please explain.

It is normal for your mobile phone to automatically send SMS to MMS. When the number of short messages exceeds 10 (670 Chinese characters), they will be automatically converted into multimedia messages. Please feel free to use. If the number of characters does not exceed 10(670 Chinese characters), we suggest you try the following methods:

1. Uninstall the recently downloaded and installed third-party software.

2. Try changing a SIM card.

3. Try to restore the factory settings.

If the problem still exists after the above operation, it is recommended that you bring the purchase invoice, three-guarantee certificate and mobile phone to the local Samsung service center for inspection by engineers.