As expected, would-be iPhone 6 owners are currently wading through a torrent of trade-in and upgrade offers. It's all very, very confusing. But AT&T is being clear about one thing: If you trade in an iPhone 4, 4S, 5, or 5C, you will get at least $200 credit towards a new device*.

That's pretty good, if you want to join up with AT&T! And it's especially good if you own an iPhone 4, which is about to be obsolete. Presumably this applies to working handsets only, but we've asked AT&T for clarification on just how messed up your device can be. If you trade in an iPhone 5S, you'll get $300 in credit. You can also get an extra $100 in bill credit "with the purchase of any iPhone when activating a new line of service with a smartphone on AT&T Next," a plan that lets you pay for your phone over monthly installments.

This is a good deal, but not necessarily the best out there. T-Mobile and Sprint promise to meet or beat any other trade-in deal. T-Mobile will also give you an extra $50, if you can find someone that will offer as much as they will. In a phone call with Gizmodo last week, a T-Mobile representative said that they're offering as much as $350 for the iPhone 5S. Which is super good. So trade wisely.

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* - The deal doesn't start until Friday, September 12, so don't be concerned if you don't see it on AT&T's website before then!