But T-mobile is the only version that allows you to not input carrier info therefore yes completely unlocked for GSM carriers only, unless you buy outright in store to get the CDMA/GSM versions.
Do you think that it would be possible to complete the checkout quicker by opting for the T-Mobile version, since it doesn't require carrier info? I already have my carrier info (AT&T) stored in the app and would be curious to know if Apple will ping them during the checkout process.