ESN (Electronic Serial Numbers): an electronic serial number. In a CDMA system, cleanup a unique id

ESN (Electronic Serial Numbers): an electronic serial number. In a CDMA system, cleanup a unique identifier is to identify the physical hardware devices. That each handset are using this unique ID to identify themselves, just like human identity. An ESN has 32 bits, which is 32/8 = 4 bytes. ESN with eight hexadecimal represented as 0x801EA066. With the increase cleanup in other CDMA mobile device, ESN was not enough, so launched a median more MEID. MEID (Mobile Equipment ID): Mobile Equipment Identity. As I mentioned before, due to the increase CDMA mobile device, resulting in the original 8 of ESN is not enough, so launched a 56bits of MEID code, MEID can be expressed as 14 hexadecimal cleanup code, such as 0xA1000002B0BEB2. CDMA phones beginning 0xA said, if it is 0x9, it means multimode phones. pESN (pseudo ESN): pseudo-ESN. pESN was launched to solve the problem of forward compatibility, pESN format and ESN is exactly the same, the only difference is the use of 0x80 is pESN beginning. The MEID into pESN, you can normally use in support of ESN's C network.
java MessageDigest provided in this class to implement a series of hash algorithms, you can call this class to be operational, the calculation process and hexstring attention converted cleanup to byte between. Here are some of the current situation: 1, a cell phone can only have one ESN or an MEID. ESN codes are as 6800,6900; cleanup but 6950 started on the use of MEID yards. 2, with ESN or MEID code of the phone can support the normal use of the ESN's CDMA network, ESN codes can not only support the use of mobile phones cleanup within cleanup the MEID of CDMA network. 3, China Telecom's C network should have started using MEID authentication, and starting in 2005 began to replace the MEID ESN.