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Next tip » What is SIM only? SIM only is a new type of mobile phone contract that provides the mobile service with out the handset. This type of contract is lower commitment and usually very competitively priced but you need to provide the phone yourself.Which contract length? SIM only deals usually come with a choice of two contract lengths; 30 days or 12 months. The 30 day contracts are more flexible but are slightly more expensive than their 12 month counterparts.Why SIM only? If your contract has finished and are happy with your phone, moving to a SIM only contract will make financial sense. Or, if you can provide the handset a SIM only deal is the cheapest way to receive your mobile phone service.