(NAPSI)—The carrier contracts of millions of iPhone users will expire in 2013, offering iPhone owners a chance to slash their bills by switching providers. The process, known as unlocking, is giving iPhone 3 and 4 models a new lease on life. iPhone owners who entered into service contracts years ago will find that their choices have expanded dramatically since then. Dozens of mobile operators now offer service for the iPhone on quality voice and data networks at a fraction of the cost.

Unlocking comes with two additional benefits: customized plans and no more contracts. For example, a new provider, Ultra Mobile, offers affordable and convenient international talk and text choices for iPhone users. It is the only mobile phone service providing a no-contract, $49-per-month unlimited voice and 4G data plan that includes up to 1,000 minutes of international call time and complimentary global texting. The carrier also provides each of its customers with Call Me Free, a service that enables individuals living abroad to call Ultra customers for free, which is appealing to those with friends or family living outside the United States.