1. minefan006's Avatar
    I bought the S10 Verizon (version/model?) from Samsung.com a while back. Now I need this phone to work with either SK Telecommunications or KT Olleh as I will be traveling to South Korea in the near future.

    In preparations for this I was going to check if my S10 worked with other carriers so when I put in a sim card not from H2O I get a message from the Setup Wizard saying "SIM Card is not from Verizon Wireless" I haven't added a plan to the other sim card yet so IDK if it works even with the message as I've heard that the phone still works with other carriers even if this message comes up. (I don't care about the message as long as it works)

    Consider me paranoid or what not but I don't get an Unlock Prompt after restarting so I think its carrier unlocked but I haven't found a clear answer for it nor have I found a clear answer if my S10 will even work on SKT or KT Olleh.

    So here are the questions, Is my S10 carrier locked or unlocked? and Will my phone work with other carriers and if so will they work with SK Telecommunications and/or KT Olleh?
    06-22-2019 06:36 PM
  2. mustang7757's Avatar
    I bought the S10 Verizon (version/model?) from Samsung.com a while back. Now I need this phone to work with either SK Telecommunications or KT Olleh as I will be traveling to South Korea in the near future.

    In preparations for this I was going to check if my S10 worked with other carriers so when I put in a sim card not from H2O I get a message from the Setup Wizard saying "SIM Card is not from Verizon Wireless" I haven't added a plan to the other sim card yet so IDK if it works even with the message as I've heard that the phone still works with other carriers even if this message comes up. (I don't care about the message as long as it works)

    Consider me paranoid or what not but I don't get an Unlock Prompt after restarting so I think its carrier unlocked but I haven't found a clear answer for it nor have I found a clear answer if my S10 will even work on SKT or KT Olleh.

    So here are the questions, Is my S10 carrier locked or unlocked? and Will my phone work with other carriers and if so will they work with SK Telecommunications and/or KT Olleh?
    If you order from Samsung directly you should of went with the unlocked model not tied to any carrier. If you can test a friend's sim from another carrier you can find out if it's locked or not. And should be fine to use overseas if it is unlocked.
    06-22-2019 06:52 PM
  3. B. Diddy's Avatar
    I moved this from the Galaxy S forum (for the ancient original Galaxy S phone) to the S10 forum.
    06-24-2019 01:59 AM
  4. Rukbat's Avatar
    If it doesn't ask for the unlock code, it's not locked.

    Since the phone covers LTE bands 3, 5 and 8 (and even 7, 28 and 38), you should be fine on 4G. Voice and text, if they're still using 2G, is universal on that phone, so that will work too. (If they're using 4G, of course it will work.)

    So I'd say you're good to go.

    The one thing I'd do is borrow a SIM from a friend who uses either AT&T or TMobile (or even Sprint) and see if you can make a quick call using it. That would prove that it's unlocked.

    (Possible problem - from all I can find out, South Korea uses CDMA for 2G, which Verizon no longer does. The information is probably out of date, but if it's not, only an older Verizon phone would work there (or a phone made for the South Korean market), but GSMArena lists the S10 as 2G CDMA capable for the USA model only, so the web is probably, as usual, behind he times.)

    According to an October 2016 site, South Korea no longer uses 2G CDMA, so the phone has to:


    1. Be unlocked
    2. Have a SIM card slot that have no SIM card slot to prevent customers from taking their phones to other networks
    3. Support WCDMA 2100 MHz frequencies – which may be the problem, but ...
    4. [OPTIONAL] Most newer phones nowadays support LTE data, which operates on bands 3, 8, and 26 in Korea. Which the USA S10 does.


    If all this doesn't confuse you even more, I hope it helps.
    06-24-2019 03:30 PM

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