I bought an Iphone 5 while living in the U S. And I am now using the phone in Israel. The phone is unlocked and all the settings everywhere on it are set to 4G. However the main screen next to the carrier name keeps saying 3G I went to the phone carrier Hot Mobile and they said there 4G frequency is 1800 Megahertz GSM which everything I checked on the specs on this phone says I'm supposed to be able to receive that frequency on this phone. The carrier then told me I am receiving the 4G signal on the phone even though the main display says 3G and he's saying it's doing that cause it's a U S bought Iphone. But I really am receiving 4G. Is this so? And if not, how do I get the main display to read 4G and not 3G? Someone please help me with this. Thank You very much in advance.