Please follow the below steps to change the language to thai :
Open settings >> general management >> language and input >> language >> add language >> tap on three dots at top right >> add languages >> scroll down and select the language as shown in the below image.
The 3.5 mm jack has been removed to pursue additional values. By deleting the 3.5 mm jack, the device improves a design perfection allowing the slimmest Note device of 7.9 mm. And, it allows expanding battery capacity. However, you may purchase type C to 3.5 MM jack convertor.