First, we have this official information from Apple. An Apple store employee has told me that, when I purchase an Apple-unlocked (GSM) iPhone 5, its LTE bands are locked to the carrier whose SIM that I insert into the phone. This is a very important question. And, I want to make sure that we have the right information. Am I correct to assume that, with an Apple-unlocked iPhone 5, any GSM LTE bands (1,3,4, 5, and 17) can be active as long as an inserted SIM supports them? That is:  Insert an AT&T SIM in the U.S., and LTE bands 4 & 17 are active.  Insert a Softbank SIM in Japan, and their LTE bands become active.  Insert a Deutshe Telekom SIM in Germany, and their LTE bands become active. Am I correct?