In telecom lingo, people who frequently switch LD carriers are spinners. It's public info that AT&T & MCI put in place processes to minimize giving incentives to spinners (e.g. many of those here in FT). Some of you have discovered how to work around these rules.
If you swtich to MCI or AT&T for miles, you can change plans after your switch is confirmed. (To confirm your current LD carrier, call 700-555-4141. On this free call, you'll hear a recording naming your current carrier.) After your switch is in, call the company's customer service to switch to a no-fee or lower-fee plan. With MCI, it's easy to go on the web site to do this. You'll also receive a $1 monthly credit if you set up online billing directly to your (presumably miles earning) credit card.
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He who dies with the most miles ... is dead.