How to remove the region limitation of Android market

1st of all, you need root and login your google account before doing below. Then

su
setprop gsm.sim.operator.numeric 310260
setprop gsm.operator.numeric 310260
setprop gsm.sim.operator.iso-country us
setprop gsm.operator.iso-country us
setprop gsm.operator.alpha T-Mobile
setprop gsm.sim.operator.alpha T-Mobile
kill $(ps | grep vending | tr -s ‘ ‘ | cut -d ‘ ‘ -f2)
rm -rf /data/data/com.android.vending/cache/*