Your question is divided into two aspects. 1. The handheld APP can't handle business. Maybe the APP you downloaded is wrong, or the telecom in your area can't handle business through the handheld business hall. The second question is about the ROOT of the mobile phone, which means that the mobile phone can get super administrator rights. For example, if your mobile phone is custom machine, there are many customized telecom service clients that cannot be uninstalled, but if your mobile phone is ROOT, you can uninstall it at will. The last thing I want to tell you is whether your mobile phone is ROOT or not, and whether you can apply for a business room!