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Depending on who is your carrier, you may consider asking them.

I am with Rogers/Canada and I cannot tether because I am on a 500MB plan. Their policy is 1GB and above.
 
I have an account based on "fair policy" which is hard to brake even if you use your phone as modem. My question was more about if it is possible with a bb and which app on my bb do I need (where can I download it). Only disadvantage of BB is the very limited amount of apps compared to apple.

Depending on who is your carrier, you may consider asking them.

I am with Rogers/Canada and I cannot tether because I am on a 500MB plan. Their policy is 1GB and above.
 
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