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http://gsm.vn/ : The best Mobile forum, a lot solutions 4 your mobiles. This site allow you post with [code] tag, so you can read all topics and see all links without sign up.
https://www.numberingplans.com/?page=analysis&sub=imeinr : Analysis mobile's IMEI. Type your IMEI number, website will display all informations ab' your IMEI.