Welcome back. It might be a good time to upgrade your iphone. If you've been hanging on to an older model, Bloomberg reports, Apple will offer a higher trading credit for older iphones for the next two weeks. The company hasn't said anything about the promotion but Bloomberg says it will be given in store to customers to be used for any iphone model there. Apple lists trade in values on its website for all the models going back to the iphone seven. Well target.