Thankfully, the kidnappers had previously told Jim what they wanted. Money, of course, which he'd deemed idiotic. Out of all the things someone could want from him, money? He'd had heaps and heaps of information, codes, secrets - and they wanted money? That's how he knew they were small time and belonged under his Italian shoes.
He noticed some of them flinched when he pulled his phone out. Jim wiggled it to show off and said, "I'll send a transfer through. You just go ahead and untie him." Yes, he was going to be sending something through, but it wasn't going to be what they wanted. Jim was far more clever than that. The plan was to send a nice little virus to all their connected devices, with a nice bow on top of confusion when it made said devices beep at them rapidly.