Perhaps these Jews were already burned once or twice by people whom they trust and who likewise violated that trust.
I have gotten burned lending my cell phone, for someone who just had to make this urgent call of a few seconds to let someone know where they are. So I’ll give you 2 examples, so you comprehend why I shall never lend my cell phone to anyone ever.
1) I was walking thru Har Menuchos this past Adar, and someone just had to call up to let someone know where he was in Har Menuchos; Thereafter I was getting so many calls demanding to speak to this person, for many hours thereafter. When I said I am not this person, they were becoming very aggressive & angry & insisting that I must know this person & find him, because he did call from my #.
2) After a wedding in Monsey this past Nisson, someone had to borrow my cell phone to call up a car service, as he had no way of getting home. He had to call several car services, and even then never got a car service. Thereafter, somewhere around 2.30AM this car service calls my cell phone saying that they see we called up, and would we like car service? Needless to say, we were woken up and it took us a long time to fall asleep again.
Needless to say, we are not lending our cell phone to any stranger at any time.