Using S22 with latest December security patch update but Voice focus is not showing when m on call why this??Need help thanks

Using s22 should I update to android  13.Any bugs??

Recently bought s22 and found there is a September security patch update shall I update it now or not??  how is the battery life after update?

Is it good to buy samsung s22 8/128 gb after all discounts n exchange offers? I'm getting it at 36.2k after exchanging my Samsung s10 8/128gb for 24790/- which is 2.5 Yr old no scratches n dents have box n original charger n how abt the exchange poli...