To top up your card, first make sure your iPhone supports NFC. Then download and install the corresponding Gantong card recharge application, and complete the registration and login.
Select recharge options in the app, select " Transportation card recharge " Enter the amount to be recharged, and select the payment method, generally you can choose a bank card.
Point the top of the iPhone at the top-up machine or NFC payment device provided by the merchant. After the connection is successful, confirm the payment and enter the payment password to complete the top-up.