tamil language voice recognition is not supported

sir,

i am having iphone 7 plus mobile,and it is typing tamil language letters.But it is not typing while we pronouncing or dictating the tamil language,even though we installed 'Gboard' of Google keyboard or any other third party keyboards(Tamil).kindly give me a solution for this major issue.Because of this problem,i even change my idea to buy latest iphone 11 pro.,[BUT ANDROID PHONES ARE NOT HAVING THESE ISSUES]

THANKS,

vijayaram,

INDIA