I have two iphone 5's and one has Cellular and the other shows mobile data. Why do the two phones show different menu names?

I have two iphone 5's and one has Cellular and the other shows mobile data in the menu's. Why do the two phones show different menu names?

 

 

Iphone 5: Settings>General>Cellular

 

Iphone 5: Settings>General>Mobile Data

 

Has anyone seen this before? The phone with mobile data as the menu also did have the hotspot shortcut on the main settings screen.

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