The Country wise carrier code are as under, which can be used to unlock the iphone with X sim (turbo sim)
USA Phone
Sprint (CDMA) - 3160100, 3160101
AT&T - 3104101
Verizon - 2040400, 2040438
UK Phone
T Mobile - 2343300, 2343091
Three - 2342091, 2342003
O2 - 2341039, 2341000
Orange - 2343320
Vodafone - 2341590, 2341500
Sprint (CDMA) - 3160100, 3160101
AT&T - 3104101
Verizon - 2040400, 2040438
UK Phone
T Mobile - 2343300, 2343091
Three - 2342091, 2342003
O2 - 2341039, 2341000
Orange - 2343320
Vodafone - 2341590, 2341500