When mobile became antenna-less, getting signals was a rampant problem when you go places like basements. So mobile manufacturers made it to a point to make signals stronger but some mobile phones are not that strong enough that the owner buys a wireless cellular booster just to make it work.
One of the things that scare me with mobile phones is when it has no signal. I can’t help but imagine the movies I saw where the person became a helpless victim because he or she can’t call for help because of no signal. So that is one of my fears. Call it naïve but yes… so crazy!!