T-Mobile is gearing up to make a big splash in the world of mobile marketing, targeting customers who have unlocked iPhones and are looking for a better deal. Starting September 21st, T-Mobile sales staff will be encouraged to sell against Apple's iPhone, with a focus on enticing customers away from AT&T.

A recent memo has confirmed that T-Mobile will not be an official carrier for the next-generation iPhone, set to launch next month. However, the magenta carrier is still looking to make inroads with existing iPhone users by highlighting the significant savings they can enjoy if they switch from AT&T. According to a new flyer, customers can save up to $1,500 over two years by making the switch.

T-Mobile's single line offering looks like an attractive proposition, providing truly unlimited data, text, and minutes for just $75 per month. However, it's worth noting that customers in areas with 3G coverage may not experience lightning-fast speeds, as T-Mobile has been working to expand its iPhone-compatible network. For now, EDGE 2.5G is the fastest option available.

As an unofficial iPhone carrier, T-Mobile has always made efforts to welcome unlocked iPhone users onto its network. With around 1 million iPhone customers already on board, the carrier is looking to capitalize on this growing trend with a new MicroSIM kit designed specifically for iPhone 4 and iPhone 4S users. The updated kit will hit stores on August 29th.

Considering the substantial savings on offer, it may be worth considering a switch to T-Mobile if you're currently experiencing slow speeds or high bills. While the carrier's flyer focuses specifically on AT&T customers, the savings are likely to be comparable for Verizon and Sprint users as well. Ultimately, the decision to make the switch will depend on your specific needs and coverage in your area.

Check out T-Mobile's flyer for family plan savings below:

(Note: Please keep in mind that this article is a rewritten version of the original text and may not include all the same details or information.)