If your service is within a contract period, an early termination fee will be applicable upon service cancellation. These fees are tyically the remaining value of the contract. For example:
Monthly Service Value: $1,000
...
Contract Term: 12 Months
Total Contact Value: $12,000
Cancellation Notice Given At: Month 7
Early Termination Fee: 5 months ($1000 x 5) = $5,000