Why can't I use LTE on the replacement?

Hi,
Several days ago, I sent my iphone 5 for repairing and Apple gave me a replacement. Before the repair, I use LTE on my old iphone and it worked very well. However, on the replacement phone, I am not able to use LTE any more(the LTE is turned on), even if I reset the network settings. In addition, there was a "personal hotspot" in the top level of settings, however, on the replacement iphone, it disapperas and I can not use personal hotspot, either. Is that a hardware problem or a software problem? How can I solve it?
Thank you

try resetting all settings.
did you restore from a backup? if yes, backup your iPhone again then Restore it as New (setup as new, dont restore from backup) to test the iPhone. if it will be the same then it is an iPhone's fault.

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