When i go in the store to see if i want the iphone 8 plus all i got to do is just give them 31.24 a month

Generally new phone purchases are the price of the phone and service throught that carrier over a 2 year period.

Oh great! I hope that includes the service plan.

Is there a specific question?? If that's what Best Buy is telling you you're paying per month to lease the phone, if it's a $600 phone, by the time you pay it off it's going to be over $900 for it. FYI Other than that, not sure what you're talking about.