when i open my phone write samsung and stay thear for ever.if i want to turn off i must put away the battery.tell me what can i do please.thank you.samsung g810.

Hello,
The solution for this problem is a Samsung officially certified service center. Please bring your mobile there for furthur help.
If your samsung product is newer that means you have brought it in last few months means if it is not 1 year old then you should bring your gurantee card or cash slipt with orginal bill with you.
Always remember to give detailed information like your handset model before posting your question.
This must help you.
Regards.