  Smartphone carrier companies rely on mobile networks for keeping an accurate
record of customer data usage for billing purposes. In this paper, we present a
vulnerability that allows an attacker to force the victim's smartphone to
consume data through the cellular network by starting the data download on the
victim's cell phone without the victim's knowledge. The attack is based on
switching the victim's smartphones from the Wi-Fi network to the cellular
network while downloading a large data file. This attack has been implemented
in real-life scenarios where the test's outcomes demonstrate that the attack is
feasible and that mobile networks do not record customer data usage accurately.
