What do you mean by just receiving a short message from Unicom? Upgrade the 4g terminal for free.

1. The Unicom message you received is true. Unicom is now giving users a free upgrade of the 4G network (both batch opening and active application are free), so that everyone can experience the speed of 4G Internet access. If you don't need it, you can go to the Unicom business hall or call the customer service center to apply for cancellation.

2. In addition, Unicom is now giving users the activity of replacing mobile phone cards in batches for free, that is, SIM cards can be replaced with USIM cards for the first time in Unicom's own business hall (the capacity of USIM is much larger than that of SIM cards, the capacity of USIM is 128K, and the capacity of SIM cards is 64K). Your mobile phone terminal supports 4G, so you can better experience Unicom's 4G network.