update

Usually it's a monthly security patch update. Then for major OS updates newer phone models have a 3 cycle update.

If you have an S10 or older phone you get 2 years of updates. You also get 2 major OS updates. S20 and newer gets 3 years of updates and 3 major OS updates.

at least 2 years security updates, quarterly for mid-range and below with up to 2 major updates. newer a51 series above up to 3 years security updates quarterly and monthly for S , N and enterprise phones, 3 major updates.