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1、手机专业术语（Mob订eterminology）I.terminologyrelatingtooperators1,GSMGSMistheabbreviationofGLOBALSYSTEMOFMOBILE(globalmobi1ecommunicationsystem).Itisastandardofdigitalmobi1etelephonesystemdevelopedbyEuropeanTelecommunicationStandardizationAssociation(ETST)・2,CDMACDMAistheabbreviationofCodeDivisionMultipleAc
2、cess,thatiscodedivisionmultipleaccess(CDMA)・Itisaccordingtothestandarddesigninfrequency(IS-95)9001800MHZrangedigitalmobiletelephonesystem.Withthestronganti-interferenceability,largesystemcapacity,highconnectionrate,smallnoiseandsmalltransmittingpower,theCDMAsystemcanrealizeallkindsofSmartServicesofm
3、obilephones・3,SIMcardSIMcardistheabbreviationofSubscriberIdentityModle(useridentificationmodule),whichstorestheuser，ssigninginformation,andPINisthepasswordofSIMcard.4,PINPINistheabbreviationofNumberPersonalIdentity,intendedfortheindividualuseridentificationcodeissettopreventthemobilephonestolenandth
4、epasswordis4digits,theinitialvalueis1234,theusercanchangethemobilephoneaccordingtoinstructions・IfyouenterthewrongPINcodethreetimesinarow,theSIMcardwillbelocked・PINcodehasPIN1andPIN2codetwo,PIN1isSIMcardpersonalidentificationpassword.PIN2isusedtosetcellphonebilling・Ifyouenterthreeerrors,youneedtounlo
5、ckwiththePUK2code.PIN2andPUK2thesetwopasswordsandnetworkbillingandSIMcardinternaldatachangesrelated,soitwillnotbeopen,andevenifthePIN2passwordlock,itwillnotaffectthenormaluseofmobilephones・Therefore,PIN2codeandPUK2codedonothavetopayattentionto.1,PUKTheunlockcode(PUK)istheunlockcodeoftheSIMcard.Techn
6、ically,whentheuser*sSIMcardislocked,theusershouldentertheSIMcardunlockcode(PUKcode),enterthecorrect,SIMcardlocktoopen.IfyouenterthewrongPUKcode10times,theSIMcardwillbeautomaticallydiscarded・IftheuseraccidentallylockedtheSIMcard,therearetwowaystosolveit:1)immediatelyturnoffthemobi1ephonepower,nolonge
7、rdoanyactiononthephone,andthenwithmobilephonesandSIMcardsandpurchasedocumentstotheoperator，sbusinesshall,pleasetechnicalpersonnelunlock・2)calltheoperator'sservicehotline,afterasimpleuserinformationche
