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I recently upgraded my plan from 4G/LTE to 5G. I’ve read that I need to go into connections/mobile networks/network mode and  select 5g but the only options I have listed  involve  LTE/WCDMA/GSM. Do I need a new SIM card?

The whole S20 series (S20, S20+, S20 ultra, Note 20) has a firmware issue that doesn’t allow 5G to work and Samsung has said that they will not be releasing any more firmware updates for the phone unfortunately.