St. Louis (KSDK) -- Apple is expected to unveil a new iPhone Wednesday, and if you're like a lot of people, you want to know if it's worth it to trade in your old iPhone.
In some cases you can get more than $300 for your old iPhone.
The Gazelle website can help you find out what your current iPhone is worth.
Once on the site, you pick your model and carrier. Then you select how much data space your phone holds and what condition it is in.
Then you get an estimate.
Here is an estimated range of what you can expect. If you have an iPhone 4S, with AT&T and 64 gigabytes of space, you could get about $315 to trade in your phone. If you have an iPhone 4, with less storage space, you're in the $140 range. If you're on the low end, like an iPhone 3GS with only 8 gigabytes, you might only get about $30.