Samsung i8 150 mobile phone sends text messages without sound or vibration.

Hello, thank you for using Samsung products! According to your description, I8 150 mobile phone suggests that you check whether the information notification bell and vibration are turned on. The specific operation method for adjusting the vibration mode of the mobile phone is as follows:

1, Settings-Sound-Vibration-Select-Always.

2. If you want to adjust the volume of SMS alerts, please follow the following methods:

Settings-Sound-Volume-Select the notification volume to the maximum -OK.

I hope the above methods will help you, and I wish you a happy life!