GMA News reports:

“Security researchers in the US have discovered security holes that can allow commuters paying with NFC-enabled Android devices to have unlimited free rides on public transport.
Matteo Collura, 18, and Matteo Beccaro, 19, presented their findings before the hacking conference DefCon last weekend, tech site Mashable reported.
“You can get free rides for your life,” Beccaro said at the hacking conference Saturday.”