Hello. If you inserted the SIM cards while the tablet was 'on', then restart the tablet and the SIM cards should be picked up just fine on reboot. Otherwise, try using another SIM card to see if the problem is with the tab or SIM card' if the other SIM card works then you need to replace your SIM card' if not, there might be a broken pin from the tablet's SIM card slot or dirty pins. Please try this: Turn off the tab, blow the SIM card slot using any air compressor, insert two registered SIM card on your tablet, reboot and observe.
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