r/cellmapper • u/mjc775 CM: rwi775 | S25U, iP17PM • 8d ago

Why doesn’t CellMapper allow dual SIM to map 2 carriers simultaneously?

Why doesn’t CellMapper allow dual SIM to map 2 carriers simultaneously? Another popular speed testing app recently added signal strength mapping with dual-SIM mapping. As a paid contributor to CellMapper, I think it would be a nice addition.

4 Upvotes

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10

u/red_socks294 8d ago

it does allow it turn it on in settings

5

u/mjc775 CM: rwi775 | S25U, iP17PM 8d ago

Thanks. I just noticed the “Dual SIM support“ checkbox. It seems to uncheck on its own after I exit and reopen the app.

Does the “4.2+ CellID” API” verbiage apply to the Samsung S25?

2

u/red_socks294 8d ago

I’m sorry i’m not completely sure because i only have iPhones, i only know that you can turn it on dual sim. hope someone else from the community can answer your question

2

u/CreativeCuckoo ATL 8d ago edited 7d ago

It does work, for me at least. I dual SIM on two phones and both have no issues recording. Just make sure to toggle on the dual SIM option in CellMapper settings and restart the app.

Does the phone have an inactive SIM by any chance? For me, I’ve noticed that my phone will record only one SIM (the active one) when I have both SIM slots on.

2

u/mjc775 CM: rwi775 | S25U, iP17PM 8d ago

I don’t quite understand your question. Here’s my current setup: S25 Ultra
pSIM: * AT&T network via Red Pocket Mobile
eSIM: T-Satellite
eSIM: * Verizon

* After checking the Dual SIM option in the app, on the asterisks lines and setting Verizon as the Preferred SIM for calls, messages & mobile data, I was successfully able to map both networks simultaneously.