You look at the reception signal for SIM1 and SIM2 also different already

I also noticed this for mine but mine are both prepaid

One can be 4 bars signals while another only shows 2 bars

Sometimes need to toggle airplane mode only both will show same strength

I suspect could be connected to different tower or telco (since now 4G can use unifi own network + maxis + celcom*)

*CELCOM not sure still have contract with unifi or not

2G I can confirm because my house will jump between CELCOM and MAXIS

Well I guess.. pay cheap get cheap network

Today again, CELCOM 2G full bars but SMS not coming in... switch to 4G then received

Your issue only the telco can answer you as I am anti postpaid

Just hope your plan has no contract.. then you are tied for 1 month then ciao lo

Just assume Mon-Fri excl PH

No idea bro as I said I no see postpaid, my unifi mobile prepaid lasted me from launch and topped up RM10 that's all