Starting tomorrow, Sunday, December 11, RadioShack is preparing some discounts for the Apple iPhone 4S and iPhone 4 on AT&T’s network. The information reportedly comes from the retailer that has informed MacRumors about the upcoming discount program.

You’ll still need to sign a two-year contract with AT&T but if you are looking for an iPhone 4S or iPhone 4, you can “take advantage of RadioShack’s $30 instant savings paired with the company’s Trade & Save program, which will guarantee $100 to as much as $200 off when they trade in their eligible iPhone 3GS or iPhone 4″.

The table above should help you see prices more clearly and, if you bring an iPhone 4 16 GB or 32 GB in great shape you will get the maximum $200 trade-in benefit.

Source: MacRumors