DeviceFidelity offers protective cases with NFC for iPhone users to make mobile payments, and the company has partnered with Visa and MasterCard. The company this month announced the In2Pay iCaisse4X NFC, which is a protective case and battery pack with an NFC antenna. The case allows iPhone users to pay for products by tapping a smartphone to a reader. The case has microSD storage, which is necessary to initiate and authenticate user data for transactions. As a bonus, the case has a battery pack to power the iPhone.

DeviceFidelity sells directly to businesses, which will determine pricing for the case, said Stephanie Barrueto, marketing manager at the company. DeviceFidelity's Moneto mobile wallet will come with the iCaisse4X NFC case later this year, Barrueto said. Moneto is currently available as with a prepaid debit card, an iCaisse case for current and older iPhone models, a microSD storage card, an iPhone app and $10 pre-loaded on the card.

Barclay PayTag

Barclaycard in the U.K. has introduced PayTag, an NFC sticker that can be attached on the back of smartphones to make contactless payments. The NFC sticker communicates payment information to a receiver at a payment terminal, and using a PayTag is easy and safe, the company said. The technology is an "extension" of a customer's .

The sticker is a third the size of traditional credit cards, and users don't need to upgrade smartphones to use PayTag, Barclaycard said. Payments are limited to £15 (US$23) for now, but will rise to £20 in June, Barclaycard said. A number of U.K. vendors including McDonalds, Boots, WH Smith and Tesco have signed up to accept payments. Buses in London will be on board by the end of this year and the subway network in London will accept payments by next year.