Call AT&T. and ask about your eligibility for a "cross upgrade". All of the online tools said I was not eligible for subsidized pricing, after one call to AT&T (611) I was informed that if I upgrade the iPad line to the iPhone 5, I can keep the iPhone 4S number, and pay normal subsidized price! I can now upgrade every year at subsidized pricing, simply by upgrading my iPad line every other year. Note, you may need to be on the shared data plan for this.