iPhone Dual SIM, one SIM goes standby when another one is active

iPhone Q&A
1

Bro I’m using iPhone 13 one is physical another is esim secondary sim gets off while in call what should i do to use dual sim in call

2

Hi bro, only with WiFi calling ON we can use two sims active at same time. otherwise with GSM Network or LTE network, we will experience dual sim dual standby mode. which one sim goes inactive when we are on Call.