There are several possibilities to enter your home without a smartphone.
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Mechanical key
You can still use your existing, mechanical key. -
Friends & family
You can ask another authorized person (friends, family) to open the door for you. If you have online access to your Nuki device, this even works from afar. -
Smart accessories
Good alternatives to open your door simply and quickly without a smartphone are the Nuki Keypad and the Nuki Fob.
Note: At a power level of 20% Nuki will notify you via the Nuki app and directly on the device trough LED signalization. So there is enough time to replace your batteries of your Nuki device.