The 5G SIM card is required because it is designed to work with the advanced features of 5G technology, such as faster data speeds and lower latency. Without a 5G SIM card, your mobile device will not be able to connect to a 5G network, even if it is 5G-enabled.
Similarly, a 5G-compatible mobile device is necessary because it is designed to work with the 5G network's advanced features. While some older mobile devices may be capable of connecting to a 5G network, they will not be able to take advantage of the full range of benefits offered by 5G technology.
It is also important to note that not all 5G networks are created equal. There are different types of 5G networks, including low-band, mid-band, and high-band (also known as mmWave). Each type offers different levels of speed and coverage, so it's important to check which type of 5G network is available in your area and whether your mobile device is compatible with that particular type of network.
In summary, to use 5G technology, you will need both a 5G-enabled SIM card and a 5G-compatible mobile device that is compatible with the type of 5G network available in your area.