A 2006 'Mobile Life' report suggests that pay-monthly contract phones account for 52% of all UK mobile phone sales.Offering numerous advantages over pay-as-you-go mobiles, 12 or 18-month contract phone plans cater for varying needs. Before you dive in and order a fancy new phone, be sure you know the ins-and-outs of mobile contract deals.A mobile phone contract is what mobile users sign-up to when subscribing to a pay-monthly mobile phone plan. Contract lengths are typically 12 or (the more prevalent) 18 month contract.Most pay-monthly plans offer you the handset for no up-front cost - the cost of the handset is subsidised by the monthly line rental fee. In exchange for a monthly line-rental fee, you get free inclusive minutes and cheaper (than PAYG) call tariffs. Pros* Most mobile phones are available with pay-monthly contract plans.* Contract tariffs are typically cheaper than PAYG tariffs.* Typically, the whole of the handset's price is subsidised by the line rental. Most contract mobile phone plans include the handset for FREE.* Free line rental deals can potentially save you lots of money.You need to be 18+ to buy a contract phone. A credit check will also be performed. You'll need a valid UK credit/debit card, bank details and 3 years address history. Learn about mobile contract deals Read buyers guides and other information about contract phones. Informing yourself about the ins-and-outs of mobile phones, means you can make a confident buying decision.Buyers' Guides - Essential tips to help you buy a mobile phone.Research the latest mobile handsets View the latest handsets at retail stores, mobile comparison services, blogs, forums and other information sites. You can buy a contract phone offline - at retail stores - or through one of the many online mobile phone shops. Mobile network operators sell contract deals through their own online stores - Vodafone, 3, T-Mobile, Orange, O2 and virtual network operators such as Virgin Mobile also have their own store. You can also buy a contract deal at one of the many online mobile dealers who act as resellers for the mobile network operators.Mobilesift - Compare the latest mobile phones on offer from leading retailers.Mobile Gazette - Writes about the latest mobile phone handsets.