SOS call are not working proper in Spreadtrum CPU

[Shoya]

Hey friends, I have Lawow F800 dual Sim mobile phone. It is a nice phone with Spreadtrum CPU. but before a few days I got a problem in my phone. I don't know why my telephone write on dislpay " -SOS-" and everything I push, make a call to SOS number. So, I am search on Google about this problem then I know my phone is on the SOS mode. Then I reset the factory setting but still the problem is there. How can I deactivate the SOS mode? Please help me how to solve this problem

[robot.txt]

I have GNEXT GN50. I also have Spreadtrum CPU and get a same problem in this phone. my phone shows SOS on display. I make Google search then don’t get any solution for this problem. So, finally I download the flash file and flasher from internet and flash my phone but it is same Phone is in the SOS mode. In one website I got another solution which is change the IMEI of phone. so I try that also but the problem cannot fix. Then I understand it is definitely hardware problem not a software problem.