I was watching one those criminal TV shows on the US side awhile ago.
So cops wrongfully accused a woman for the killing, evidence pointed to two people but one looked like the women did it. Later they discover the male suspect they had in sights was the one.
How they figure out?
The wifi on his cell gave him away. Cops looked at his sim card / cell tower ping he was not in the area but close, but the woman - jailed - was later in the area that day when she drove by, which the body was there already. But the male suspect sim card was off his cell phone or removed but not his Wifi signal. His wifi signal was pinging for a device every so often when he deposed of the body. So I guess there must be a software that you can see or read the log files to see how many times your wifi pings and where.
The case happened about 15 - 10 years ago.
I don't have wi-fi, blutooth "o"n at all. But if I was married I would also remove the sim card and turn off the cell phone.