What can Samsung Telecom do with mobile and Unicom cards?

Generally speaking, if it is a dual-mode Samsung telecom mobile phone that supports GSM, you can use mobile and Unicom cards to make phone calls and send text messages, but you can't surf the Internet. If it is a single mode, only telecom cards can be used, and mobile and Unicom cards cannot be supported. The main difference between different versions of mobile phones lies in the different network standards they support. The choice of network mode depends on its internal configuration, which does not mean that it can be changed by cracking and modifying the system. Just like a radio can only receive short-wave radio, in order to improve its receiving range, it is necessary to modify its hardware parameters and antenna, that is to say, it needs to be changed from the hardware, which is not something that non-technicians can operate.