It is probably not a good idea to make your main current number one of your rolling numbers. If you use your current number on business cards or anywhere else offline, it may cause inaccuracies in the call reporting. People presumably would call your current number from received business cards in the past, or from your number saved in their contact information.
You can still track this number on its own, however, by allowing Delacon to provide call tracking services specifically for this number.
It might be worthwhile to check our rolling number calculator which will tell you how many rolling numbers you would need give you the most accurate tracking.