How To Make The Most Money Possible When Selling Your Old iPhone

Daniel Goodman / Business InsiderOne of the most annoying aspects of the device upgrade cycle is figuring out what to do with your old device once you've decided it's time to buy.

Go straight to our iPhone sales guide >

We know that the next version of the iPhone is going to be unveiled next week and that it will probably come out before the end of the month.

It's been a long wait for Apple's latest announcement for those like me who bought an iPhone 4S the last time I renewed my cell contract.

The wait has given me time to look into the options available for parting with my 4S.

Based on convenience, reliability, and the prices each company is offering, these are the best sites for selling your iPhone.

Disclosure: Jeff Bezos is an investor in Business Insider through his personal investment company Bezos Expeditions.