Just a little knowledge about electricity and look for the appropriate connectors to open remotely from your smartphone door intercom.
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1. Power supply 5VDC
3. download Ewelink to smartphone
What you should do:
connect the power supply, find the control cable lock on the intercom, cut it and connect the ends of the relay normally open, add the device to the application on your smartphone, enter a name and password wifi and enjoy opening the lock without going to the intercom. It is possible that you will have to set the JOG MODE - then attach the lock will last 1 second.
You do not have to know how to program a cheap life easier for yourself.