Definition of a 5G SIM
A 5G SIM is a tamper-proof secure element, the only solution to secure 5G network access.
It has been specified by the 5G standardization body ETSI-3GPP in Releases 15 & 16 UICC specifications (UICC: Universal Integrated Circuit Card, better known as a SIM).
A Universal Integrated Circuit Card or UICC (better known as a SIM) is the only platform which can be used to secure 5G network access according to the 5G standardisation body (3GPP).
Will a 5G device work with my current sim? Yes, your 5G device will be able to use a 4G sim to receive 4G/3G/2G coverage whenever it needs to.
But if you want to use our 5G network, you'll need to swap to a 5G sim.
Will 5G use up my data allowance quicker than 4G?