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SMARTY is a UK SIM-only mobile network owned by Three, offering 30-day rolling contracts with no credit checks, no annual price rises, and no lengthy commitments. All plans include 5G at no extra cost, EU roaming, and unlimited calls and texts. SMARTY distinguishes itself through transparent pricing and a discount model where unused data reduces the next month's bill on selected plans. The network uses Three's infrastructure for coverage across the UK. Plans start from a few pounds per month for low data allowances and scale up to unlimited data. SMARTY operates a refer-a-friend programme where both the existing customer and the new joiner receive a reward, typically a gift card or free month, once the new customer stays for a qualifying period.