Apple kicks off iPhone Upgrade Event

According to 9to5mac Apple launched an iPhone upgrade event at its U.S. retail stores with increased trade-in values and heavy promotional efforts.

"Apple has sent out a memo to Apple Store staff instructing them to push upgrades to iPhone 4 and 4s users with increased trade-in values. The company has also started contacting customers by email and promoting the event with new signage in its retail stores."

The employees have been told to check customer's eligibility, inform them about the iPhone Reuse and Recycling program, and push recently increased trade-in values for iPhone 4s and iPhone 4. 

Apple will offer up to $199 for an iPhone 4S and up to $99 for an iPhone 4. Depending on the device, a customer could even upgrade to an iPhone 5S for $0.