If you're looking to trade in your iPhone, here are some options

iPhone trade-ins are a big business. And with an iPhone 6s and 6s Plus (or will it be the iPhone 7 and 7 Plus?) almost certain to be announced at Apple's Sept. 9 media event,  sources like iCracked, Gazelle and NextWorth, which are currently offering a lot for the iPhone 6/6 Plus, will drop the price once the new devices are announced.

iCracked, an on-demand smartphone repair and trade-in service, will actually send an "iTech" directly to your home or office to pick up your Apple smartphone and give you some moolah right on the spot.The company reportedly has 3,000 iTechs trained and standing by to buy back phones. iCracked says the value of an iPhone goes down by 5% every month.

Gazelle, an electronics buyback service, is offering up to US$481 cash for old iPhones. In fact, between now and Sept. 9, the company is running a "Best Price Guarantee" that not only offers up to $481 cash for old iPhones, but a promise to beat any competitive trade-in offer from Apple or its four major iPhone wireless carriers (AT&T, Verizon, T-Mobile or Sprint). 

The offer is good for the iPhone 5s, 6 and 6 Plus. However, Gazelle won't come and pick up your old phone. You'll have to ship it to them, though shipping is free. You can get paid by check, Amazon.com, gift cards or PayPal.

NextWorth Solutions, which offers in online and in-store electronics trade-in programs including NextWorth.com, accepts trade-ins online and in-store across a range of consumer electronics categories including smartphones, tablets, e-readers, video games and laptops. It offers a "30-Day PriceLock" guarantee so that "customers can lock in trade-in prices starting today to ensure the best value when upgrading."

NextWorth trade-in pricing for iPhones starts at $25 for an iPhone 4 and goes up to $480 for an iPhone 6 Plus. You can get a precise quote for your Apple smartphone at the company's website. Shipping to NextWorth is always free.

Another option is uSell.com, which "connects you with hundreds of professional buyers." At the site, select your device and you'll be shown a list of offers. Accept a cash offer and uSell will send you a pre-paid shipping kit with tracking included. Payment is done by PayPay or check. The buyer of your iPhone is expected to issue payment within five business days.

It's Worth More provides a pricing calculator to get an instant quote based on the condition of your iPhone. Once you accept an offer, you have 14 days to ship out your item to qualify for the price guarantee.

Once It's Worth More inspects your iPhone, it pays you in the method you've selected: check, PayPal, or Chase QuickPay. It's Worth More claims to pay up to $263 for an iPhone 5s, up to $576 for an iPhone 6, and up to $616 for an iPhone 6 Plus.

Glyde, an online marketplace, has an online form for entering the item you wish to sell (listing is free). When your item sells, you're sent a Glyde shipping kit, complete with a pre-paid label. 

Proceeds are deposited into your Glyde account (yes, you have to set one up to use the service) days after delivery to your buyer. You can use the cash on Glyde, withdraw it to your bank account (free), select Bitcoin as your payment method (free), or get a paper check mailed to you (for a $2 fee).

There are other iPhone trade-in/selling options, but, outside of Apple and the wireless carriers, these are the main ones.