The Global Phones are phones with CDMA and GSM modems but that are usually configured to primarly work on CDMA network and at least to be able to call on GSM network. If you have a Global Phone for CDMA Network and you want correctly use it on GSM Network than you have to edit the build.prop file to fully enable the GSM(2G)/UMTS(3G) and you have to set APNs to use data. Correctly editing the build.prop you will unlock the hidden menù Testing if it is locked as for Verizon phones, and you will be able to manage the baseband and you will enable on every Rom these advanced gsm features: GSM/UMTS -> [GSM auto (PRL)] in Testing menù SMS MMS 2G/3G Data USSD Code Call Forwarding Testing menù accessible dialing the code *#*#4636#*#* with this patch: your SIM GSM will be detected by roms CDMA...