I switch my numerous phone lines so often, I need to keep a spreadsheet to keep track of which line is with which long distance company and to confirm bonuses have been received. I switch them back and forth all the time.
One thing to keep in mind: You can't switch back to the orginal long distance company and expect to get a sign up bonus for the same frequent flyer account.
An example: sign up for Sprint-Northwest Airlines. Get Sprint bonus and switch to MCI with United Airlines. After MCI bonus posts, switch back to Sprint-Northwest but use another family member's account :::OR::: switch back to Sprint-Alaska and get a bonus.
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[This message has been edited by MileageAddict (edited 04-29-2001).]