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I read somewhere that the Dev Team strongly suggests not using chip-based unlocking solutions. I vaguely recall the rationale having to do with chip-based solutions uploading misinformation to the applicable network (e.g. ATT in the USA), which violates the law.
 
Its only costs $23.50, including shipping... Even if it is against the law, is it something that is watched? Would it cause any billing errors?
 
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