I bought my Inspire on day one and let me tell you guys how much I love this device. Unfortunately my job can leave me separated from a power supply to recharge this bad boy. I am considering using both devices. I would like to use my blackberry 9700 on days that I know I will be away from a power supply. Do you guys know if my bill will go crazy or if something will get f**ked up if i switch out my sim cards on the regular? I am not expecting to use full functionality of BIS/BES throughout the day. Thoughts?