An intriguing Apple patent application was discovered Thursday, hinting at a solution to how smartphones could be owned in developing nations, such as India. The patent filing describes a way a handset owner could defray the cost of a smartphone’s data plan by viewing advertising.

The patent application published by the U.S. Patent and Trademark Office, is entitled ‘Method and system for managing credits via a mobile device.’

Apple patent (iWallet ads)

In the same way Apple’sPassbookfeature stores coupons and such, this proposed technology would expand the concept of digital wallets…

Credits could be delivered to handsets, either on a post-paid or pre-paid schedule. Post-paid users could have the electronic cash automatically debited from their digital wallet to pay for their service, for instance.

In one option outlined by Apple, smartphone owners could receive “tokens” from advertisers that could then be used to reduce the cost of the telephone service.

Other companies could issue vouchers or coupons that are delivered to the consumer’s smartphone. Along with reducing the price of a data plan, the vouchers could also purchase“real world”items at a store’s POS.

It could also tie nicely with a rumoredless-pricey iPhonethat’s allegedly targeted at price-minded shoppers in emerging markets like Brazil, India and China, where Android cheapos have hurt Apple’s standing.

In India, Apple is experimenting with a number of ways todiscount the price of an iPhone, including offering a year to pay for the handset. In such countries, carriers do not offer handsets at subsidized prices, causing consumers to pause at the idea of buying a full-priced iPhone.

Apple also sees such a digital wallet as a way to encourage smartphone ownership via subsidized or free phone service.

The company writes in the patent application:

Other techniques to provide subsidized or free telephone services to the users are also envisioned.

For subsidized telephone services, the users may be responsible for a portion of their usage and thus they would be interested in eliminating unnecessary use of such telephone services.

The paper trail of the patent application also reveals Apple’s interesting relationship with a Finnish company, CVON Innovations.

The patent application was first filed in 2008 in Great Britain, then transferred to Apple. A previous CVON patent for mobile advertising was also transferred to Apple, according to AppleInsider.

While Apple is content with charging its ad-free experiences at a premium, in the case ofiRadiothe firm is taking a different approach. AnAdAge storyasserted yesterday that iRadio tap Apple’s own advertising platform to inject both in-app iAds and audio advertising into iRadio streams.

Also interesting: whereas Google’sAll Accessservices is provided as a $9.99 per month subscription, iRadio is understood be free to consumers.