(Telecompaper) Apple is starting an iPhone trade-in programme this month aimed at getting users to upgrade to the iPhone 5 and turn in older models, people with knowledge of the plans told Bloomberg. Apple has teamed up with distributor Brightstar to run the scheme; Brightstar also handles trade-ins for AT&T and T-Mobile USA, as well as other carriers and device makers. The scheme is expected to provide a boost to Apple's sales growth, which has been slowing in recent quarters. AT&T currently offers as much as USD 200 for working iPhone 4s and 4Ss, which could let some customers buy an entry-level iPhone 5 with no initial payment. Analysts estimate that as many as 20 percent of US consumers buying a smartphone this year will do so via a trade-in programme. Apple is expected to refurbish the older models it receives and sell these on in emerging markets where consumers are interested in cheaper devices. Apple already runs a trade-in programme on its website, but the new service will only be available at Apple's retail outlets, letting consumers receive payments instantly, the report said. Apple also worked with Brightstar to help AT&T and T-Mobile with their recent trade-in promotions.