Excuse me, how does A7 modify the SMS ringtone and set its own music as SMS ringtone?

According to your description, the operation method is as follows:

First of all, the phone comes with SMS ringtone settings.

1. In standby mode, click Info.

2. Press the menu key, and then click Settings.

3. Click the notification location, and then click Select Ringtone. After selecting the ringtone to set, click OK to save it.

Secondly, customize the SMS ringtone settings.

If you want to copy your favorite songs and set them as SMS ringtones, please follow these steps:

1. In standby mode, click Application.

2. Select my folder.

3. Select the SDcard folder to import.

4. Select the menu key, and then select New Folder.

5. Enter a folder name in the new folder. Enter Notification as the name and press OK.

After the above operation, you can connect your mobile phone with a computer as a mass storage, and then copy the songs to the newly created notification folder, and then set them in the ringtone of the mobile phone message.