I cannot input or save any APN details and my mobile data does not work. Please help!

Hello,

I have bought an unlocked samsung galaxy s5. It seems it is a phone from the USA, previously on Sprint network. I am using a Brazilian local carrier's sim card which is realtively new (4 months old). The phone is a G900P.04 running android 6.0 Marshmallow.
The mobile data is not working. Calls to the phone work fine, but no data.

I am trying to input the APN for my network here in Brazil (Vivo).
Every time I input the APN settings, and select 'save', nothing happens and the APN list...

I cannot input or save any APN details and my mobile data does not work. Please help!

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