4G sims are compatible with NSA 5G which will ride on the 4G network as a base layer but for SA 5G it might need a separate one. When Jio first launched 4G network they didn't know whether they will go for NSA or SA deployment.
India’s first 5G services were launched by Prime Minister Narendra Modi at the India Mobile Congress (IMC) event over the weekend, which also featured a raft of announcements and technology demonstrations from the country’s vendors and service providers.
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5G network in eight cities: Delhi, Mumbai, Varanasi, Bangalore, Chennai, Hyderabad, Nagpur and Siliguri.
Finally an official confirmation from Jio clarified that a sim change won't be needed for 5G and existing subscribers will be given an option to just opt in to start using 5G.
Finally an official confirmation from Jio clarified that a sim change won't be needed for 5G and existing subscribers will be given an option to just opt in to start using 5G.