my freind works for rogers.. and he got a blackberry pearl.. he has free unlimited call,txt msg, dataplan, and can buy **** from rogers store for free(dont ask me how he did it -__-)

so im wondering.. if i am with him.. can i pop in his sim card in my 3g and use the internet? or download ****..
is there gonna be a problem?

my 3g is jailbroken.. locked to rogers