With pre-orders for the iPhone 6 and the iPhone 6 Plus happening this Friday, many people who hope to get their hands on one of the new devices are going to be scrambling to find out their upgrade options. TUAW has assembled a helpful guide on to help users check their upgrade eligibility and purchasing options.

Users on all four major networks in the United States can type a quick code into their phones to get an immediate report on their upgrade status via text message. The codes are as follows:

- AT&T: *639#

- Sprint: 1311

- T-Mobile: #874

- Verizon: #874

These codes are a good way to get a quick look at upgrade eligibility, but some of them don't exactly tell the whole story. For example, AT&T's text message is pointing users towards a Next plan, even if they may have other upgrade options available. A second option for getting a clear picture of upgrade eligibility on the four major networks is going through Apple's own site.



Visiting the iPhone 6 pre-order page and choosing a model, carrier, and color will give an option to "Check your upgrade eligibility" with AT&T, Sprint, and Verizon. T-Mobile works somewhat differently as Apple only gives T-Mobile customers the option to buy outright.

Checking upgrade options requires a user to enter a wireless number, billing zip code, and the last four digits of the social security number on the account, after which it displays all of the upgrade options available, including when an account might become eligible for an early or full upgrade.

For example, an AT&T user who purchased an iPhone 5s on release day on a two-year contract would be able to purchase an iPhone 6 for $649 on pre-order day, but would also be eligible for an early upgrade on September 21, which provides a $200 discount. This option also displays what Next monthly fees would be.



Many times, new purchasing fees can be cut by trading a device into an Apple Store, a carrier, or a third party service, all of which offer payouts for old Apple devices.

For those planning to upgrade, it's important to look into options immediately as there are only two days left until the iPhone 6 and iPhone 6 Plus will be available for pre-order. Though Apple has not yet confirmed what time the two devices will go on sale, AT&T says that its pre-order sales will begin on September 12 at 12:01 AM Pacific Time, and it's likely Apple's own sales will start at the same time.