Help Samsung Galaxy M919v Help

[sab22k]

I recently switched from wind mobile to fido and was able to get LTE on my phone for a little while by changing the band preferences, but I am unable to make any calls. Is there anyway I can enable LTE on this variant of the S4 and make calls? I am only able to get 3G network

 

[Rukbat]

Calls are on the 2G network, so make sure you didn't turn off, or otherwise mess up, your 2G settings.

 

[sab22k]

I dialed *#2263# > Band Preferance > and selected LTE all, that allowed me to use LTE.

Then when I select a specific band like 4 or 7 it will change to LTE.. Until a call is made then it switches back too 3G and doesn't revert back to LTE.