A fatal flaw, however, is that it is actually possible to modify (flash) the MEID of many, but not all, CDMA chips.
It is what carriers use to connect phone calls, deliver SMS’s, blacklist stolen phones, etc.
QPST AND CDMA WORKSHOP MAC
This is like the MAC address of an ethernet / WiFi card in that it is the sole identifier of the CDMA chip. So what information exactly is stored inside the CDMA chip? Here’s an incomplete list:
This is typically called "programming" the phone by U.S. It is (I believe) not possible to change the information stored on the CDMA chip from the OS itself instead, carriers provide a special number (e.g., *228 for Verizon Wireless) that, when called, will transfer the information to the chip. All of this information is stored directly inside the chip (unless you have a Verizon Wireless LTE phone with a SIM card), and not on any file system controlled by the OS this is why even after a factory reset (which formats the internal flash file system) these settings persist. This chip is responsible for carrying out voice calls and transferring data over 2G/3G, and in order to do that, it needs to know stuff like what phone number it represents, what towers to connect to, what account name to bill the 3G connection to, etc. Programming the CDMA chipĮvery CDMA phone (obviously) has a CDMA chip (radio).
QPST AND CDMA WORKSHOP ANDROID
I cannot be held responsible for any damage or legal consequences resulting from or related to the application of this information.Īt a high level, there are two places where carrier information is stored on a CDMA Android phone: inside the CDMA chip (radio), and in Android OS system files. In such cases, your comments and insights are welcome.įinally, a disclaimer: I have no formal understanding of any of the intricacies of CDMA technology and therefore cannot guarantee the correctness or accuracy of this information. Hence, it may not be applicable to other phones or carriers in particular, the section about CDMA chips do not apply to CDMA phones that require a SIM card, such as some Verizon Wireless LTE phones. CDMA carriers, Verizon Wireless and Sprint. Note that this information is based on my research with the Jelly Bean (4.1 & 4.2), ICS (4.0) and Gingerbread (2.3.4) versions of Android and two major U.S. As I have not been able to find a compilation of this information elsewhere, I am writing up this document in the hope that it will help others with flashing phones or porting ROMs to different carriers. I was recently able to figure out the answer to this question when I successfully flashed a CDMA phone from Sprint to Verizon (an exploit documented in Flashing a Sprint Nexus S 4G to Verizon). is typically locked to a particular carrier so how is that done? Unlike GSM phones with swappable SIM’s, however, a CDMA phone sold in the U.S. In the U.S., all major CDMA carriers operate on the same frequencies, which means that there is no inherent difference in hardware between phones sold by any of them, and that theoretically there is no reason why a Verizon Wireless phone cannot work on Sprint or MetroPCS or Virgin Mobile or Boost Mobile, for example. Have you ever wondered how CDMA phones are programmed to a specific carrier for voice calls, SMS and data?
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