Tomorrow morning i was also facing the same problem but now my problem. There are two reasons behind the problem Why this problem happens in our smartphone. (1) Hardware problem (2) Software problem This article will help you https://okadtech.com/how-to-fix-sos-only-on-huawei-solution-for-all-huawei-devices/ If your problem is because of any hardware problems then you have to take you smartphone to any service centre but if it’s because of any software problem then you can just take help of this article and solve your problem.