[Q] Status:Bootloader unlock allowed:No

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http://forum.xda-developers.com – So guys on my phone it says that i am not allowed to unlock the bootloader.I bought this phone at O2 in London,they unlocked it for me and i can put any sim-card of any network it will work.So i don't quite get this when i type the code to see configuration of my phone ( *#*#7378423#*#*)>Service Info>Configuration>Rooting Status:Bootloader unlock allowed:No.So i read that if it says like this i cannot root my phone.But is there anyone in this forum that can provide me steps how to change this or can i bypass this or anything,or should i take it to O2 so they can do that for me...???I (HowTos)