Fifth'd.
We get work laptops. It is assumed that we will occasionally check on the status of runs, occasionally do a quick debug and relaunch a failing simulation or tool run. Total time average around 5 minutes (including boot time and VPN), multiplied by maybe once a night, maybe three or four times over the weekend.
People who are on call get phones. People who aren't don't. People who are on call know that when they are being hired or promoted. People who aren't, are not. Managers who treat employees as if they are on call, when they are not, very quickly get significantly less off-hours work being done - the guy or gal who might have wanted to get some work done in spare time no longer wants to.