- Is it normal for my moto g4 phone to switch to cell mode in standby?
Depending on how your phone is configured it will switch to Cell when you leave WiFi or if for some reason there is an issue with your WiFi. Walk-n-talk often leads to this.
If you mean calls come in on cell when the phone is sleeping then your phone is experiencing the issue described in this thread:
Is your phone losing its WiFi connection while sleeping?
There is a work-around for this problem. Go to the end of the thread above and then go 10 posts up from the last post.