I want to write a thriller where the main character is on his own, and not able to rely on the police for most of the story. However, I am setting it in modern times, and in the days of cellphones, it's difficult to put the MC in this situation. I was thinking that the villain could maybe put a radio jamming device on the MC's car, so that the MC can never use his cellphone, as long as he is always within a certain proximity of the car. However, how long can I keep this going before he figures it out. And there is always the solution of driving to a pay phone, which cannot be jammed, cause it's a land line. So I am wondering is that a good idea to keep on using for the plot, or what is the best way to keep the MC from not calling and being forced to take on the villains without help?