Prueba con estos, uno te tiene que funcionar ya que con esta calculadora he liberao varios 6021 de vodafone.

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These Nokia Unlock Codes are Generated For Nokia 6021 with IMEI: 354838018167788 (DCT 4) Locked to Provider Vodafone / Airtel Movil in Spain and will only work with this phone!

#pw+048013082632227+1#
#pw+022403277036514+2#
#pw+782100347053210+3#
#pw+456427235456633+4#
#pw+042923521041131+5#
#pw+239425765706432+6#
#pw+003063430152470+7#

Recommended CODE :#pw+003063430152470+7#

Remove SIM CARD !
Type #
Then press the * key 3times (you should get a "p")
Then press the * key 4times (you should get a "w")
Then press the * key 2times (you should get a "+")
Then enter: 003063430152470
Then press the * key 2times(you should get a "+")
Then enter: 7
Enter: #

IF UNLOCK SUCCEEDS YOU SHOULD SEE RESTRICTION REMOVED ON SCREEN, YOUR PHONE IS NOW UNLOCKED!