I think usage policy is not only on the data bandwidth
In any case, today a 2 gb limit is inadequate. Most providers give you a 5gb cap at a pretty low cost (similar to the 2gb price). We give 5 fb limit to all our team members at the cost of Rs. 750 per month. The speed thereafter drops, which is also ok for most purposes.
Policy most be more in :
- who will get a data card
- what type of data card
- handing it over and back (like asset policy)
- what it will be used for (business requirements only)
- what it is not to be used for
- whom to call for assistance
- what action will be taken for violations.