Mobile phone unlock question.?

I have an LG G6 (Sprint) that I bought used. I have no idea if it is SIM carrier unlocked or not but I want to use it with T-Mobile. So I ordered a T-mobile Sim card and it came yesterday. When I put the sim card in, it says a new sim card has been detected and it reboots. When it comes up, it does not ask me... show more I have an LG G6 (Sprint) that I bought used. I have no idea if it is SIM carrier unlocked or not but I want to use it with T-Mobile. So I ordered a T-mobile Sim card and it came yesterday. When I put the sim card in, it says a new sim card has been detected and it reboots. When it comes up, it does not ask me for an unlock code or anything and everything appears to be normal EXCEPT mobile networks does not work. When I go into settings the mobile networks is grayed out and cannot be selected. I also can't get in to change the APN because that area is grayed out. Are these the symptoms of not being carrier unlocked or is something else wrong?
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