The number of Nanchang Unicom is in Ji 'an. Can't free phone calls and text messages be used?

Yes, there is a charge for cross-regional off-site services. This is what we call roaming charges. It is suggested that if you are away from Ji 'an for a long time, you can use VoIP first. In this case, there is no charge. I used to use a very good program. You can have a look. If you are in Ji 'an for a long time, I suggest you change your local mobile phone number.