In Canada, all iPhones purchased for full retail price at an Apple Store or online at apple.com come unlocked which allows customer selection of carriers. iPhones sold in Canada purchased through mobile carries such as TELUS, Rogers, or Bell were locked to their respective networks and unlocking required visiting a carrier store and paying an unlocking fee. Third-party methods to unlock iPhones existed but were highly unreliable and sometimes rendered phones unusable.[citation needed] However, in 2017 the CRTC abolished SIM-locking and required that all mobile devices sold after December 1, 2017, come unlocked.[216] The CRTC also mandated that carriers must offer unlocking services of existing devices for free to consumers, regardless of whether or not they had purchased the phone themselves. In Australia, the three major carriers (Optus, Telstra and Vodafone)[217][unreliable source?] offer legitimate unlocking, now at no cost for all iPhone devices, both current and prior models.