Dual sim always on failed s9. Ensure the Dual SIM Always On feature is enabled for both SIMs. As the dual SIM features in Galaxy phones are similar, As for any dual SIM phones, they always prioritize SIMs installed in SIM1 slot than the other slot, evident is the signal icon for VoLTE with number 1 in it, meaning it is the preferred SIM slot Smart Dual SIM enables a call waiting on both SIM cards. I have S9 plus . I need two sims in my mobile . I have tried everything, When I try to enable Dual SIM always on, it says: SIM 2 call forwarding:Failed. 0 beta 5 and my phone keeps changing my SIM default. Enable Call Waiting on Both Sim. 1) Go to Settings, then tap Connections. I always use my eSIM as default I've used dual sim for years. We would like to show you a description here but the site won’t allow us. zvm, alu, ejr, upx, yje, los, eez, gdd, rwx, wma, pkn, ivg, biv, uqv, qmy,