Can I take the SIM card from my Sierra Wireless USB and use it in my cellphone

[Corrie]

for internet without charges? I'm already paying for my internet in my Sierra Wireless USB from AT&T. And when I need internet on my phone, I take the card from it, and put it in my cellphone. I would like to know if any additional charges apply, or if there will be any complications.

Thanks,
Corrie