Just a FYI for folks. If you have an older residential grade alarm system with a cellular primary or backup, you may want to initiate a test call to your alarm monitoring service. A popular cellular backup device used 3G networks, now being shutdown this year.
I noticed my cell backup device flashed red, and sure enough no longer online. No notice from the alarm company.
Not a huge deal. I'm overdue for a home security overhaul. Going down the Ring Alarm / camera route. No Telco landline needed and comes with a cellular backup option to internet.