BG571043846 Iam goign by memory: 1) install iCSee app on smart phone, 2) create account on iCSee app, 3) put batteries in doorbell, press the bell and immediately after the sound press the rest button for 10 seconds, you should hear confirmation that the device is reset to factory setting, 4) on the phone, turn on Wifi, click on Add Device from inside the iCSee app, then press the ring button on the doorbell, this way the app will configure the doorbell to connect to your WiFi network, 5) now you can place the doorbell anywhere within the range of your WiFi network, it has a back plate that can be screwed or glued to any surface.

BG571043846 Idon't know for sure because I am using Android, but I believe it should be compatible with iOS if the app "iCSee" is available on the app store. Also, after a few weeks I have to say that I am not happy with the product, sometimes when the doorbell rings the phone rings as well, but sometimes the phone does not ring at all, I tried re-installing a few times but it did not help.