Hello Rafi Haftka,
There is line of devices I might consider, from a company called "GreatCall". (https://www.greatcall.com)
The various "GreatCall" devices have a built-in cell phone, that would greatly increase your chance of contacting somebody in in a short amount of time during an emergency health event. It also has a GPS so it knows your location. These devices would generally work as long as: Your location during the emergency has cell phone coverage, your device is charged, you are wearing your alert device, and you are conscious long enough to make the emergency call.
Once your device is set up, the only required maintenance is setting the device in the charger at night, and making sure that the device is worn on your person during the day. I have personally used the "GreatCall Splash" device. It seems to work as far as making test calls to the monitoring center. Service prices for the "splash" start at $20 per month. The splash also has a feature that if you hold the button down for 5 seconds (instead of pressing it normally), it will directly call 911 instead of the GreatCall monitoring center. You can customize your "emergency profile" for these devices, including adding family members and cryonics providers that you would wish to have notified in the event of an emergency.
Warm regards,
Blake