Little help pleasssse !!!!! topic

Hi guys as i know the lg optimus 2x has p990 in the model number and the T-mobile g2x has p999 in the model number ...the problem is that i have T-mobile written on the front of my phone but whene i checked setting===>about i found p990 in number model also i found lg p990 in the ticket under the battery !! Iwant to install a custum rom so which forum should i use this forum or the T-mobile forum ???

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