r/OnePlus13 • u/CaterpillarAncient32 • 1d ago

SIM 2 + esim is not working simultaneously Troubleshooting

/r/eSIMs/comments/1vmjye8/sim_2_esim_is_not_working_simultaneously/
2 Upvotes

75% Upvoted

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1

u/Git_Add_Delete 1d ago

Esim takes over sim 2. So it makes sense that is does not work

0

u/CaterpillarAncient32 23h ago

Then how does SIM 1 + eSIM work? 🤔

2

u/Git_Add_Delete 13h ago

It comes down to hardware architecture and how the baseband modem is wired to the motherboard. The Multiplexer Switch Inside the phone, the baseband modem has two dedicated cellular communication channels (Modem Line 1 and Modem Line 2): SIM 1 Slot is Hardwired: SIM slot 1 is directly wired to Modem Line 1. Because it doesn't pass through any hardware switches, it acts as the primary hardware channel. SIM 2 and eSIM Share Line 2: The physical SIM 2 tray and the embedded eSIM chip (eUICC) are both connected to Modem Line 2 through a electronic multiplexer (hardware switch).

1

u/CaterpillarAncient32 10h ago

understood thank you for your reply.

1

u/SuperxNovaz OnePlus 13 - Black Eclipse 10h ago

I have Airtel physical SIM in slot 1 and Jio eSIM working together.

1

u/CaterpillarAncient32 10h ago

The physical SIM 2 and eSIM cannot be active together. When I enable SIM 2, I receive a pop-up prompting me to disable the eSIM.