Editing SIM lock (section)

=== Box breaking ===
{{Main|Box breaker}} 
A practice known as ''box breaking'' is common<ref>{{cite web|url=http://www.mobilenewscwp.co.uk/2011/06/20/box-breaking-investigation-exposes-retail-staff-breaches/|title=Box breaking investigation exposes retail staff breaches|work=Mobile News Online|access-date=7 October 2014}}</ref> in the [[United Kingdom]] and other markets. This involves purchasing subsidized handsets (usually pay-as-you-go) from retail stores, unlocking the phones, and then selling them (often abroad) for a higher price than the subsidised retail price. The SIM card that came with the handset is then either thrown away, sold, or used elsewhere. This practice is legal in the UK and provides a [[de facto]] limit to the extent to which networks are willing to subsidize pay-as-you-go handsets. While the act of ''box breaking'' is legal, some businesses are also engaging in illegal activities such as exporting the box-broken phones to other countries, to sell as [[grey market]] goods without paying import duties (known as [[carousel fraud]]) or substituting counterfeit batteries and chargers.<ref>{{cite web|url=https://www.theregister.co.uk/2003/07/28/fraud_cases_up_financial_losses/|title=Fraud cases up, financial losses down|website=[[The Register]]|access-date=7 October 2014}}</ref><ref>{{cite web |url=http://www.tax-news.com/asp/story/story_rss.asp?storyname=24716 |title=HMRC Stings Missing Traders for GBP12 Million |website=www.tax-news.com |access-date=13 January 2022 |archive-url=https://web.archive.org/web/20110716194943/http://www.tax-news.com/asp/story/story_rss.asp?storyname=24716 |archive-date=16 July 2011 |url-status=usurped}}</ref>