Quickly Check for iPhone Upgrade Eligability

<p>From your AT&amp;T cell phone, call *639# and you&rsquo;ll quickly receive a text message from AT&amp;T letting you know if you quality for a full discount on your next phone purchase. &nbsp;If you don&rsquo;t qualify, they will tell you what day that will happen.</p>

Of course, you can always walk into an AT&T store and buy a phone at full price, but for customers who’ve fulfilled at least 18 months of their two-year contract and have been good at paying their bills on time, AT&T will give you $400 off your next phone.