Verizon charges $256 per GB overage and at&t charges $512 per GB.
Huh? That can't be right!
sure it is. Verizon charges 25 cents per MB overage. There are 1024 MB in 1 GB. 1024 X 25 cents is $256. at&t charges $0.00048/KB. There are 1,048,576 KB in a GB so that's $503.