There are certain phone models that allow for NFC technology. Here is the device compatibility article:
https://www.mobilocard.com/support-articles/compatible-devices
*We recommend placing the Smart Button at the very bottom back of the phone.
Furthermore, there are certain "sweet spots" for iPhones and for Androids:
- Make sure the phone is lit up before tapping
- Tap your accessories on the top of the phone with the logo code facing the device.
- Make sure the phone is lit up before tapping
- Tap your accessories on the back center of the phone with logo facing the device