: When working normally, your smartphone can get hot up to 35-46 degrees Celsius. And believe me, it's not just about your phone , it's about everyone. Your phone is getting hotter because it is less expensive . Say Samsung and Apple , all phones are hot. But yes , if you notice that your phone is always hot up to 35-48 degrees Celsius. Even when your phone is in stand-by mode, there is a problem with your phone.