Locked 8.9"AT&TLTE Tab

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http://forum.xda-developers.com – Just bought a AT&T LTE 8.9", locked on AT& Network i treed to unlock it using cellunlocker . the problem is the ask me to inter the unlock code in the dialer and hit the call button. my device doesn't have dialer and i did install one from the market and the dialer did not work . would you please help me in this ?? (HowTos)