Why is my unlocked Verizon Samsung SM G900V difficult to use with Simplemobile and Ultramobile ?

My Verizon Samsung SM G900V does not show network signals when i tried to use it on simple mobile and ultra mobile. I can neither make calls nor receive calls. it is just too frustrating. Can someone please assist me ? I am in RI . What could have been responsible for this ?

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Upgrading O.S.
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