Philips smart lock is undoubtedly the most important part of a smart home. In addition to allowing you to easily unlock and lock your door, a smart lock also monitors who enters and exits your home while you are away. Some models simply let you use your phone to open and close the doors. They also allow you to assign special access to friends, family members, babysitters or maintenance staff. The most advanced options work with voice commands and support third-party smart home devices and services.