Ready to upgrade your phone to either the iPhone 5c or 5s? Well, we've got some good news and some bad news.The bad news? Depending on your carrier, it might be more difficult than ever this year to upgrade your relatively recent iPhone for a brand-spanking-new model. The good news? Depending on how you upgrade this year, transitioning to next year's new iPhone might be a breeze. It just depends on what you're willing to pay.And the neutral-ish news? The fact that Apple has split the iPhone into two product lines will have no bearing on your ability to upgrade to a new phone--there will be no special eligibility requirements for upgrading to the more-expensive 5s. An upgrade, it turns out, is just an upgrade, even if some upgrades are more significant than others. That means you just need to worry about which phone is right for you.A contract's a contract (
