Which data plan on att iphone using non iphone sim?

[Kenal0]

I have used jailbreak and independance to activate my iphone to use with my att sim from my blackberry with unlimited blackberry data plan. Works fine without any problems or additional charges.
My daughter wants an iphone for Christmas and currently has a razr.
She is on my corporate plan so I need to know what data plan to add to her account to use an iphone? I do not want to add the wrong account and get hit with a huge bill!!
I know it is an unlimited 19.99 data plan but which one? I need the name of it.
Thanks

[JVD]

I have used jailbreak and independance to activate my iphone to use with my att sim from my blackberry with unlimited blackberry data plan. Works fine without any problems or additional charges.
My daughter wants an iphone for Christmas and currently has a razr.
She is on my corporate plan so I need to know what data plan to add to her account to use an iphone? I do not want to add the wrong account and get hit with a huge bill!!
I know it is an unlimited 19.99 data plan but which one? I need the name of it.
Thanks

Hey Kenal,

did you downgrade the phone first, before jailbraking?

Where do you live, i'm not familliar with us rateplans but european only.
tnx

[Kenal0]

Yes I did downgrade first before jailbreaking. I followed the instructions step for step and it worked fine.
I am in Chicago area.
Kenal0