Here are eight questions to ask yourself before walking into a Cingular Wireless or Apple store later this year to shell out US$499 for a 4GB model or $599 for an 8GB model.

1. Is the cost of switching mobile carriers worth it?

For anyone who isn't a Cingular customer, this is a big question, particularly if you aren't near the end of your subscriber agreement. The cost of breaking a subscriber agreement varies among carriers, but it's always pricey. Most carriers charge in the range of $150 to $200. That's a lot of money to tack onto an already expensive device.

But that may not be the only cost. You may find that Cingular's rate plans, which have not yet been announced for the iPhone, are more expensive than what your current carrier offers for the usage and services that you need.

2. Does Cingular provide coverage where you need it?