Different operators have different requirements, you can consult the operator.
At this stage, there is no need to change the card, and 4G cards can also use 5G services, but the speed will be limited. After applying for a 5G package, the operator will lift the speed limit for users to use 5G services according to the package.
In most cases, you will not need to change your SIM card to use 5G. Most 4G SIM cards are backward compatible with 5G networks. The reason is that 5G networks often require a specific type of SIM card called a 5G SIM or Universal Integrated Circuit Card (UICC). These SIM cards are designed to support the technical requirements of 5G networks, such as higher data speeds and lower latency.
If your current SIM card is not a 5G SIM, you may not be able to access the full benefits of a 5G network, and your device may default to using 4G or lower networks.
To upgrade to a 5G SIM card, you can usually contact your mobile service provider. They will provide you with a compatible SIM card and guide you through the activation process. Keep in mind that 5G availability also depends on your location and whether your mobile carrier has deployed 5G infrastructure in that area
5G turn on method:
realme UI 3.0 & above versions: Settings > Mobile network > Click the corresponding SIM card > Turn on 5G.
realme UI 2.0: Settings > SIM card & mobile data > Click the corresponding SIM card > Turn on 5G.
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