question in unlocking the bootloader

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http://forum.xda-developers.com – ok so first 1. if i unlock the bootloader, what are the possible risks that can happen to my phone? 2. if such risks happen to my phone, is there anyway to fix it?? and 3. can if i relock my bootloader will networking functions work again if the network problem shows up? Thanks for your answers :D (HowTos)