first Anthony's answer is not accurate. the 20 digit number on the SIM card is called ICCID. it is simply the SIM card's identification number. not having anything to do with the ESN. CDMA iPhones use MEID as their primary network identifier. They use pseudo ESN when needed. Pseudo ESNs are hashed from IMEI. Asian CDMA networks use separate SIM cards. In this case UIMID from the card is used as ESN so the billing center sees consistent ESNs and IMSIs and they will accept authentication. American CDMA networks do not use SIM cards. so the ESN usually does not change.
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first Anthony's answer is not accurate. the 20 digit number on the SIM card is called ICCID. it is simply the SIM card's identification number. not having anything to do with the ESN. CDMA iPhones use MEID as their primary network identifier. They use pseudo ESN when needed. Pseudo ESNs are hashed from MEID. Asian CDMA networks use separate SIM cards. In this case UIMID from the card is used as ESN so the billing center sees consistent ESNs and IMSIs and they will accept authentication. American CDMA networks do not use SIM cards. so the ESN usually does not change.
Second, iphone is not easy to hack. MEIDs are written into the baseband. Currently you cannot modify baseband infomation. The only way to change MEID is to replace the baseband chip. But doing so will break the activation process, rendering the device unusable.
Unfortunate for you
first Anthony's answer is not accurate. the 20 digit number on the SIM card is called ICCID. it is simply the SIM card's identification number. not having anything to do with the ESN. CDMA iPhones use MEID as their primary network identifier. They use pseudo ESN when needed. Pseudo ESNs are hashed from IMEI. Asian CDMA networks use separate SIM cards. In this case UIMID from the card is used as ESN so the billing center sees consistent ESNs and IMSIs and they will accept authentication. American CDMA networks do not use SIM cards. so the ESN usually does not change.
Second, iphone is not easy to hack. MEIDs are written into the baseband. Currently you cannot modify baseband infomation. The only way to change MEID is to replace the baseband chip. But doing so will break the activation process, rendering the device unusable.