Vodafone UK Pay as You Go Trio Sim Card Trio card is triple-cut to include Standard, Micro & Nano size SIM cards. Fits any phone! A local cell phone number in the UK Pay As You Go; no yearly contract, monthly charges or credit check For activation in UK. You cannot buy topups with a US credit card. Topups can be bought at thousands of locations throughout the UK including in most airports, gas stations & grocery stores.