What could be the problem?
Network is a common issue even in dual sim smartphones. Moreover, you will have to face other issues like pathetic battery life. When it comes to triple sim smartphones, the problem really increases manifold. Rather, the interface is more cluttered in case of triple sim smartphone. The first thing you can do is to get it checked at a nearby service center of ZTE. And the best thing to get rid of all problems is to get a single sim smartphone. It will give you good network, decent battery life and simple and easy to use interface.