Android Headunit says SIM Slot Empty.

You have added a SIM card in the slot; you know you have it the right way up, and you have tried a different SIM card, just to be sure.

SIM empty

You keep getting the message that the SIM slot SIM empty.

SIM Card

Some models for the branded Android headunits can add a SIM card for Data. You don’t need to hot-spot your phone for an internet connection, but you need a second SIM plan to get the additional SIM card.

No Hot Spot

It can be advantageous not to have to hot-spot your phone or even not to have to bring your phone with you. Maybe you use a locked-down work phone or don’t want to set up hot-spotting each time. Having the facility for a dedicated SIM card in your Android headunit can be a huge plus.

SIM Empty

But what happens if the Android headunit does not recognize the SIM card? A warning message that reads ” SIM Slot: SIM empty, ” ” No SIM detected, ” or something similar indicates that the SIM card is not working in the head unit.

You’ve already tried a different SIM card.

You know it works because you tried the new SIM card on the phone.


Try inserting the SIM card in the slot and powering down the head unit. Switch it off and disconnect the car battery. When you reconnect the car battery, it will force a cold boot of the Android headunit. It may take longer to cold boot. During this cold boot (long bootup), the Android headunit checks for the SIM card presence and initializes it. When the unit has fully rebooted from cold, look for the SIM card in the slot.

You should now have a SIM card active in the SIM slot, and data should be active.

Android guy who loves his android head units as much as he loves his cherry pie.

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