X8 bootloader unlock to SIM unlock

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http://forum.xda-developers.com – Hi! I have gone through all similar topics for X8 but couldn't find the solution for me. I have a SIM-locked Sony Xperia X8 and was able to unlock the bootloader with msm7227_semc. After that however, the phone still won't work in other networks. After I insert another SIM card, I get a SIM-lock prompt which I dismiss and then go to Settings, Mobile networks, Network operators and see all available networks. When I tap on them I get a message that the phone was registered in the network, however the signal icon shows no reception. I found that this might be the case if you unlock bootloader (HowTos)