I have Verizon and to use the monthly payment to "Help" my score. I have my account set-up with a auto pay using my Citi Card. I'll pay the Minimum one month and PIF the next. It show Credit activity and gives me "Pays on Time" ratings.
I do the same thing with my Rent, Cable, Electric, Water/Sewer. Using differant cards for each account. I also have cards for Gas, Food/Grocery, "Entertainment", and one for Big Purchases. I'll alternate Min Payment and PIF each month. This does a couple things for me, My Bank sees I keep a high average balance of cash in Savings/ Checking, earned POINTS!!!!, pays as agrees, and most importantly Credit activity. A stagnent card can eventually hurt your score in the long run.
I prob waste a lot of Money in intrest ($20-30 a month range) but it's worth it for the history.