Martial

Why does Martial disable the cellphone towers? They tied up the guards, and were using an inconspicuous van to carry out their operation. Who were they trying to prevent from making phone calls? Random passersby who might report them?
Seeing as how this detail comes back to haunt them, allowing the Albanians to besiege the group without hope of outside assistance, it makes me wonder why the disabling of cellphones in the area was so crucial to the theft.