nfc does not have a level, he is a software that comes with the Android system, can replace the bus card, access card, you just copy the access card into it can be used as an access card, and you can help Yangchengtong recharge, you just open the phone to set up the light icon, the Yangchengtong close to the above identification can be recharged through wechat or Alipay, Wait about a minute to release the card