N3, you can send a general message first. Since you sent a multimedia message, as long as you send a text message, it will automatically become a multimedia message. How to solve it?

According to your description, when the SMS of Samsung NOTE3 exceeds 10 (670 Chinese characters), it will be automatically converted into MMS and cannot be changed. It is recommended that you:

1. Under mobile phone operation: Settings-Application Manager-Slide Screen Option (All)-Find Information-Click Enter to try to clear the data.

2. If the problem still exists (caused by third-party software), please back up the data of the mobile phone (phone book, SMS, multimedia materials, etc.). ) and try to restore the phone factory settings (Settings-Reset-Restore Factory Settings).

Note: all the data stored in the mobile phone is lost, so it must be backed up to the sim card and sd card in advance before operation.

If the problem still exists, it is recommended that you take the three-pack purchase voucher and send your mobile phone to the nearest Samsung service center for testing.

It is recommended that you apply for "booking to the store" in Samsung official website and enjoy priority maintenance service:/pre-order.

After the appointment is successful, please bring your machine, invoice and warranty card to the service center you reserved on time.

If you have any comments, suggestions and comments, please click: support.samsung.com.cn/survey.