The PIN that appears when pairing Bluetooth is the meaning of password. You need to enter the PIN code, generally Bluetooth headset PIN code is: 0000 or 8888, according to the Bluetooth instructions on the PIN code to connect.
PIN code (PIN1), the full name of the Personal Identification Number, is the SIM card's personal identification number, the phone's PIN code is a security measure to protect the SIM card, to prevent others from stealing the SIM card, if you enable the boot PIN code, then every time you turn on the phone, you have to enter the 4-digit PIN code.
Extended Information
Communication Connections
The Bluetooth host device can communicate with up to seven devices on a single Micromax network (a temporary network of computers that uses Bluetooth technology), though not all devices will be able to reach this maximum number.
Devices can switch roles via the protocol, and a slave device can switch to a master device (for example, if a headset requests a connection from a cell phone, it would naturally be the master as the initiator of the connection, but it might then operate as a slave device).
The Bluetooth core specification provides two or more pico-mesh connections to form a distributed network, allowing specific devices to automatically and simultaneously play the roles of master and slave, respectively, in these pico-mesh networks.
Data transfers can take place at any time between the master and other devices (except for the rarely used broadcast mode). The master device can select which slave devices it wants to access; typically, it can quickly switch between devices in a rotating fashion.
Because it is the master device that selects the slave devices to be accessed, the slave devices are theoretically expected to be on standby in the receive slots, with less burden on the master than on the slaves. A master device can be connected to seven slave devices, but it is difficult for a slave device to be connected to more than one master device. The specification is ambiguous about the behavioral requirements in a scattering network.
Many USB Bluetooth adapters or "dongles" are available, some of which include an IrDA adapter.
Query PUK code method
1, if the PIN code is locked and do not know the PUK code, do not enter it casually, then the correct approach should be to call the cell phone card belongs to the operator's hotline query, or with the owner's own valid ID to the local operator's business hall to query the PUK code to unlock. The service is free of charge.
2, self-service query PUK code?
1, when we run the card, the back of the card holder is attached with the PUK code. So, if you keep the card, you can get it directly on top of the card holder later.
2, open the cell phone business hall, log in, search for PUK code query, it will appear the current cell phone number PIN code & PUK code information.
PIN2 code is a PIN code that provides a second layer of protection for specific cell phone features. It works in the same way as the PIN code.
The PIN2 code
is used to set up your phone for billing. If your phone displays "PIN2 code restricts calls", it may be because you have enabled the PIN2 code function, but because the network does not support the PIN2 code function, you cannot use it even if you have enabled it.
Transmission and Applications
Bluetooth is available in the 2400-2483.5 MHz band (including guard bands). This is the worldwide unlicensed (but not unregulated) 2.4 GHz short-range radio band in the Industrial, Scientific and Medical (ISM) band.
Bluetooth uses frequency hopping technology to split the transmitted data into packets, which are transmitted over each of 79 designated Bluetooth channels. Each channel has a bandwidth of 1 MHz. Bluetooth 4.0 uses 2 MHz spacing and can accommodate 40 channels.
The first channel starts at 2402 MHz and continues every 1 MHz until 2480 MHz, with Adaptive Frequency-Hopping (AFH), which is typically 1600 hops per second.
At first, Gaussian frequency-shift keying (GFSK) modulation was the only available modulation scheme. However, Bluetooth 2.0+EDR enables the use of π/4-DQPSK and 8DPSK modulation in compatible devices.
Devices running GFSK are said to be able to operate at Basic Rate (BR) with instantaneous rates of up to 1 Mbit/s. The term Enhanced Data Rate (EDR) is used to describe the π/4-DPSK and 8DPSK schemes, which can be up to 2 and 3 Mbit/s, respectively. In Bluetooth radio technology, the combination of the two modes (BR and EDR) is collectively referred to as "BR/EDR radio"
Bluetooth is a packet-based protocol with a master-slave architecture. A master device can communicate with up to seven slave devices in the same pico network. All devices *** enjoy the master's clock.
References:
Baidu Encyclopedia-Pin