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I’ve always had SIM 1 (3 UK) for data, prefer 3g. I set SIM 2 (giffgaff) for data, prefer 4g, and ever since then SIM 1 will not detect the network - no network coverage.

I've now disabled SIM 2 and reverted data to SIM 1, 3g, but still no network coverage.

Jolla C, latest release of SFOS - I forget number.

Is this a known issue?

I’ve always had SIM 1 (3 UK) for data, prefer 3g. I set SIM 2 (giffgaff) for data, prefer 4g, and ever since then SIM 1 will not detect the network - no network coverage.

I've now disabled SIM 2 and reverted data to SIM 1, 3g, but still no network coverage.

Jolla C, latest release of SFOS - 3.0.3.10

Diagnosis

Changing SIM 2 to prefer 4g and selecting SIM 2 for mobile data knocks out SIM 1 for telephony - will not register. (I had to change to 4g or giffgaff - MNVO of O2 - data wouldn't work.)

I forget number.

Is this a known issue?got SIM 1 back by changing SIM 2 back to prefer 3g and relecting SIM 1 for data (though mobile data is off).

Just selecting SIM 2 for data, without changing to 4g, also knocks out SIM 1. So with these two SIMs - maybe others - I can't use SIM 2 for data without losing SIM 1.