Installing two air cards on the same computer?

Ok i need to install and use (not simultaneously) two air cards from different services one from at&t and another from verizon. Every time I try to install the at&t aircard on the computer that has the verizon one already installed on it it will crash during installation and then /the verizon one will not work. Is this possible to do what am I doing wrong

You can do 3 things
1. uninstall 1 then install 2 each time you need to change service

2. install 1 automatically then the other manually not sharing any resources, (IRQ,memory slots,dmas, etc.)

3. install a 2nd hardware configuration and use it for the other card but be aware you will need to restart the computer and switch to the alternate configuration when switching services.

If your savvy enough I would go with #2

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