How can I figure out which app on my husband's phone is charging $4.99 a month?

I called to check my phone plan because I’m looking else where.
I’m going through his apps. One seems suspicious, the NFL app. When I go it just opens up, but doesn’t say if they’re charging for it.
When I google it on another device it says “Start your 7 day free trial” but it never says how much it will cost after that.