Why did my iPhone always had no service?
No service problem, and keep searching.
苹果 iPhone 5s 于2013年9月10日公布。该设备的维修与以前的型号相似，需要螺丝刀和撬棒。可使用GSM或CDMA / 16、32或64 GB。颜色有银色、金色和太空灰。
There are several different reasons it could happen. I work on cell phones and it seems like the top 3 reasons are 1. Bad Sim card (Try a new one) 2. Phone was dropped or had a slight bend from being in pocket and baseband IC chip needs removed, reballed and micro soldered back in and 3. sim card slot is bad or needs resoldered.