Reception differs between two same-operator SIMs

asked 2018-04-01 13:42:34 +0300

Federico gravatar image

I have a dual-SIM Jolla C with two SIM cards from the same operator, as I use one for calls and one for data. It happens to me quite often that the reception differs greatly between the two. For instance, as I am writing, SIM1 (call) can get no network signal, while SIM2 gets strength just below the maximum in the indicator. What could be the cause? Any ideas on how to fix this?

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Are both SIM cards using the same technology (2G/3G/4G) when this happens? Is it the same operator only technically or is it really the same brand? (Like: Most people know that brand B is, in fact, owned and operated by operator/brand A and expect the same network infrasructure. In many cases they will b disappointed.)

ossi1967 ( 2018-04-01 15:52:53 +0300 )edit

@ossi1967 Both cards are set to "prefer 4G". SIM2 is apparently using 4G (it is displayed in the indicator in the top right of the screen); SIM1 can't connect to the network at all. The SIMs are from a "real" cell phone company (TIM/Italy) who owns their own network, not a random MVNO.

Federico ( 2018-04-01 16:00:34 +0300 )edit

When both SIMs are connected, is there a way to check which technology each one of them is using? I only see a single 2G/3G/4G indicator in the top bar.

Federico ( 2018-04-01 16:15:48 +0300 )edit

Jolla C is a dual standby device, so both sims cannot use the same technology at the same time, and this is likely the difference you're seeing

r0kk3rz ( 2018-04-02 12:28:57 +0300 )edit

@rokk3rz: But doesn't "dual standby mode" mean, that one SIM is completely disabled while the other SIM is in use, independently of the used technology (2G,3G, ...) ? BTW: I have the exact same problem than the OP! SIM 2 shows 4G while SIM 1 has no signal at all, even if SIM 2 is deactivated! And, strange enough, the problem moves with the SIM card if I switch the slots. Might this be a problem of the SIM card itself, that may not be 4G-ready (the problematic SIM is several years older than the working one)?

Kohle ( 2018-04-27 12:27:49 +0300 )edit