If you're not waiting on line somewhere to buy your new Apple iPhone 4S, and you're not one of the millions who pre-ordered one already, here's a deal to consider: Today through Sunday (October 16) you can trade in your older iPhone at a guaranteed rate at electronics retailer RadioShack when you pre-order the new AT&T or Verizon iPhone 4S 16GB and 32GB.
Here are the trade-in deals:
Check Consumer Reports Online for some overall phone-buying advice.
—Carol Mangis
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