A data connection is required. You will need a data service plan from your carrier in order to use the Bluetooth enabled cell phone as a modem.
There are a variety of data plans available:
- Limited by Data Transfer Amount
Until you really know how often and how much data you will transfer, it is probably best to go with a data plan that has a higher limit. While initially this may seem more expensive, it could be cheaper in the long run than having to pay for overages on a data plan because of a few big files or emails.
Check with your service provider to see what the rules are regarding changing plan types or if you will be locked in for a certain time period by a contract.