The location of the NFC Antenna on your mobile device can vary; depending on brand, and age. Here are a few pointers that should help you in scanning NFC cards. NOTE : There tends to be more variation in location on Android phones, due to the number of manufacturers,
Newer Android phones tend to have the NFC antenna towards the top of the device. So tap your card on the back of the phone near the top.
Older Android phones tend to have the NFC antenna towards the middle of the device. So tap your card on the back of the phone near the middle.
All Apple phones tend to have the NFC antenna towards the top of the device. So tap your card on the back of the phone near the top.