Do Unicom 3G and 4G have any influence on the call signal?

1, Unicom 3G and 4G will not affect the call signal. 4G card usually refers to the USIM card supporting Unicom's 4G network. The USIM card is safer than the traditional SIM card, and the general mobile phone card will not affect the call.

2. The call will be affected by the signal strength. When you use it at high speed, the high-speed position you pass is remote, and the signal may be weak, so the call quality is definitely not guaranteed.

3.4G network does not support voice. When talking, the network will automatically fall back to 3G and 2G networks. After the popularization of high-definition calls on 4G+ networks, you can use high-definition calls on 4G+ networks, and you can surf the Internet and make calls at the same time without switching networks.