How do you use an unlocked iPhone 7 Plus with virgin mobile phone service?

I've tried a few times and it just keeps saying no service after searching, I've kept trying and once it actually showed virgin mobile with bars and Lte for less than a min but than it went to no service. This is originally a gsm phone but has been unlocked and many other people who unlocked their AT&T or t mobile iPhones were able to use it on a cdma network but why am I struggling. Any help would be much appreciated

The phone must have a Sprint compatible CDMA radio as well as the appropriate LTE bands. Follow the instructions on virgin's website to activate.

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