Is there a device or method to call 911 even if cell phone jammers are being used in the area?

In the past, my abuser would use a cell phone jammer when he broke into my house, preventing me from calling the police right away. I tried to call 911, but the call never went through.

I eventually reported him to the police. I'm worried he'll show up again. How do I make sure I can call 911 no matter what? Will a wearable panic button still work with a cell phone jammer? What about a satellite communicator for hiking/backpacking?

Realistically, the FCC will only start investigating once the problem is frequently reported because they don't have staff around the country to do this kind of signals intelligence. If the OP lived in or near a major city, they would have more success because the FCC offices in major cities do have equipment to locate pirate signals and jammers, but again, I don't think they would respond to any single incident because they would never be able to get there in time to get the information.

There's a guy in my area who puts a jammer in his car every day when he drives on a busy interstate during rush hour because he thinks it will stop people from using their phones and make his driving safer. All the cell phone carriers reported it, but it took the FCC 3 years to actually investigate and catch him.

In areas with cell phone signal jammers, it can be very difficult to call 911 because the main function of a signal jammer is to block the network signal of the mobile phone.

However, there are several strategies and techniques that may help when calling 911 in an emergency:

1. Landline Phone: Using a traditional landline phone will not be affected by cell phone signal jammers and can directly dial 911. Although landline phones are not widely available, they may be available in some buildings (such as hotels or office buildings).
2. 
   Satellite Phone: Satellite phones do not rely on traditional cellular networks and are therefore not affected by ground-based signal jammers. These devices can connect to satellites in extreme environments to send emergency messages. However, satellite phones are more expensive and require direct access to the sky, so they may not work well inside buildings.
3. 
   Wi-Fi Network Calling: If the Wi-Fi network in the area is not interfered with, using Wi-Fi calling features (such as some smartphones and VoIP apps) may be able to bypass interference and dial 911.