1. Khwima's Avatar
    Samsung Galaxy S4 Korean (copy), Android Jelly
    Bean 4.4.4, GSM, WCDMA, LTE all options are
    available when I enter *#*#4636#*#*, but when I try to switch to WCDMA it automatically reverses to GSM only,please help!!
    06-10-2015 05:11 PM
  2. B. Diddy's Avatar
    Welcome to Android Central! If it's a knockoff/clone, then all bets are off. The hardware or firmware might be defective, and since it's not a true Samsung phone, you probably won't be able to troubleshoot it like a Samsung phone, or try to re-flash the firmware.

    If you go to Settings>Wireless & Networks>More>Cellular/Mobile Networks​, can you select the preferred network mode there?
    06-10-2015 06:15 PM
  3. Khwima's Avatar
    I tried that even before the *##*# thing. When I click on any other mode it quickly switches back to GSM only
    06-11-2015 03:26 AM
  4. B. Diddy's Avatar
    I'm just speculating here, but I wonder if maybe your clone actually doesn't have a CDMA radio, but is running a firmware for a phone that has both CDMA/GSM.
    06-11-2015 10:53 AM
  5. B. Diddy's Avatar
    Try installing System Info for Android, go to System>Telephony, and see what it says under Phone Type.
    06-11-2015 11:06 AM
  6. Khwima's Avatar
    Phone type says GSM, that explains it. no solution huh?
    06-12-2015 01:54 PM
  7. B. Diddy's Avatar
    Not that I can think of. The kind of cell radio (CDMA vs GSM) is hardware dependent--you can't modify it with software.
    06-13-2015 12:35 AM

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