Burner phones. Buy with cash. Then buy prepaid credit card with cash. Make call. Break chip immediately after. Relocate and distribute phone and card pieces across a large geographic area.
Sorry missed a step - activate cell phone with prepaid credit card.
Youdont need to activate a phone or need a sim card to call 911. You can get an old phone at any thrift shop
I believe that is also the taliban’s technique for avoiding detection.
Also, don’t tell anyone more than they need to know. That way, if they’re caught, it doesn’t compromise much of your plan.