1. Salim Serrano's Avatar
    Since February 2014 i have sim-unlocked my lumia 521 & was able to use it in the philippines Globe network from march 'till june.
    now i'm in south korea for a 2 year teaching contract & have not successfully been able to have any of the cell network providers get the 521 to work with their service.
    a fellow teacher mentioned that it may be due to the fact i need to do a device-unlock beside the sim-unlocked i've already done.

    thank you in advance for your assistance regarding this matter,
    10-21-2014 02:29 AM
  2. azcruz's Avatar
    Here's the list of mobile operators in South Korea. The network bands maybe different from that of your 521, i.e.,
    GSM network: 850 MHz, 900 MHz, 1800 MHz, 1900 MHz.
    WCDMA network: 850 MHz, 1700 - 2100 MHz, 1900 MHz.

    Rank/Operator/Technology/Subscribers (in millions)/Ownership

    1 SK Telecom CdmaOne, EVDO
    2100 MHz UMTS, HSPA+,
    Mobile WiMAX
    850/1800 MHz LTE[108] 26.46[106] SK Corporation

    2 KT 2100 MHz UMTS, HSPA+,
    Mobile WiMAX
    900/1800 MHz LTE[108] 16.91[106] KT Corporation

    3 LG U+ CdmaOne, EVDO,
    850/2100/2600 MHz LTE[109] 9.22[106] LG Corporation
    10-21-2014 02:42 AM
  3. Salim Serrano's Avatar
    thank you!
    it turns out that according to the diligence of an acquaintance in south korea that used to be a celltech for a compnay in seoul, that the nokia 521 was manufactured @ 6 months before nokias were allowed by the country's cell network to be used here.
    thanks again for your info!
    02-24-2016 09:14 PM

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