If I buy a game on my iPhone, will that be charged to my phone bill account when I pay for it next month?

It costs $6.99 and it's a really fun game. Is it worth it to buy? For example say my phone bill is $100 a month, if I buy the game will my new bill every month be $106.99? Should I buy it or not?

Hm

Your phone bill is COMPLETELY unrelated to app purchases. Your phone bill is the charge for phone call services, texting, and use of cellular data (I believe). All apps that have a cost in the App store are single time purchase. Don't worry. If the game is worth $6.99, then by all means go and buy it.

Side note: How do you know the game is fun if you haven't purchased it?

No. It would be billed to the credit card on record for your iTunes account or deduct from the iTunes card you used for it