I have a Verizon pre-paid plan on an iPhone 6s I purchased outright at the Apple Store. My plan provides unlimited minutes and texting and 2 GB of data. I get

I have a Verizon pre-paid plan on an iPhone 6s I purchased outright at the Apple Store. My plan provides unlimited minutes and texting and 2 GB of data. I get an additional 1 GB because I'm enrolled in the auto-pay program. Including taxes, fees, etc., they charge $49.15 USD to my AmEx monthly (for the advertised $45/mo. plan). My average monthly usage is ~600 MB. My girlfriend has a very similar plan on AT&T and pays roughly the same amount, though I don't know the exact details of her plan.