UI11.0
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1, whether the phone uses a metal shell, because the metal will shield the RF signal, take off the metal shell and try.
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2, whether the NFC label is placed on the metal or affixed to the metal, also because of the interference problem of the metal, the NFC label should be kept away from the metal. (If you must be close to the metal, you need to use an absorbing material - ferrite to separate the metal from the NFC label)
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3. Check whether the NFC function of your phone is turned on
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4, whether you are a Samsung mobile phone, if yes, please make sure to use Samsung's original battery, because Samsung put the NFC antenna on the battery.
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5, if you use a large screen phone, please find an NFC APP in the state of preparing to write the NFC label, hold the NFC label in your hand to find the sensing area behind the large screen phone, now the phone is getting bigger and bigger, and the NFC antenna is relatively small, the reading distance of the NFC label is generally between 1 cm and 3 cm, so you need to align it. There are also mobile phone manufacturers to make NFC next to the phone camera (because that is the only place without metal).
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6. Use the mobile NFC APP to approach the NFC tag when the APP is ready to write the NFC tag or is ready to read the NFC tag.
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7, NFC tag protocol format is not correct, it is recommended to buy fully compatible NFC Form Type2 format NFC tag, dedicated mobile NFC chip NXP NTAG series such as: NTAG203, NTAG213, NTAG215, NTAG216, (AD: It is recommended to go to NFC home to buy NFC label oh) incompatible is mainly used as an access card NFC Form Type1 format label mainly NXP S50 S70 and Fudan F08, now the mainstream NFC mobile phone basically no longer support these old chips.
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8, if it is still unable to read, it is possible that the NFC label you get is bad, then take a few NFC labels to try (the probability of multiple NFC labels being broken at the same time is very small), if it is still not possible, then it may be the problem of your mobile phone NFC, change an NFC phone to try.
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The reason why the mobile phone NFC can not read the access card is: because some access cards are encrypted, they can not be read without permission. Common access control card has ID card and IC card,ID card full name identification card, is a non-writable induction card, containing a fixed number, and IC card is divided into encryption, semi-encryption, not encryption,NFC can only copy the IC card, and is not encrypted, such a door card is very convenient direct simulation
Mainly, some access control cards are not IC cards, so they cannot be sensed
Because some access control cards are cards that operate at a frequency between 125KHZ-138KHZ, we generally call them low-frequency cards, so nfc cannot be read
Common high-frequency cards are: Beijing Municipal card (CPU chip card), contactless membership card, water card (commonly Mifare classic 1k card for 14443 A class card), ID card (14443 B class card), these cards nfc function can be read.
Our common low-frequency cards; Access cards (em410x chip card, HID chip card, t5577 chip card, etc.) are low-frequency cards that cannot be read by nfc function.
NFC working mode has Card emulation mode, P2P mode and Reader\/writer mode, NFC and Bluetooth are short-range communication technologies, and are integrated into mobile phones, but NFC does not require complex setup procedures. NFC can also simplify the Bluetooth connection, NFC is slightly better than Bluetooth in that the setup procedure is shorter, but it cannot reach the low power of Blutooth. The maximum data transmission capacity of NFC is 424 kbit\/s, which is much smaller than Bluetooth V2.1 (2.1 Mbit\/s). Although NFC does not match BlueTooth in transmission speed and distance, NFC technology does not require power, and it is convenient to use NFC for mobile phones or mobile consumer electronics.