If your phone manufacturer is:
Honor
Huawei
OnePlus
OPPO
Vivo/ IQOO
Xiaomi
The detection area is usually located near the rear camera. You may refer to the illustration below.
If the above does not cover your phone manufacturer, or area near the rear camera cannot detect your card, it is possible that the phone’s detection area is located in the middle or the lower part of the back.
If you have any questions about your Android phone NFC detection area, we suggest you reaching out to relevant manufacturer for enquiries.
Non-foldable Phone (For illustration only as the exact detection area may vary among devices):Foldable Phone (For illustration only as the exact detection area may vary among devices):
(For illustration only as the exact detection area may vary among devices)