Official O2 Classic Pay As You Go SIM Card – Standard/Micro/Nano – UK 321
3 in 1 SIM gives the option for Micro, Nano or Standard Sim size. 1 x O2 SIMCARD(3in1 SIM gives Nano/Micro/Standard option). THE POPULAR O2 CLASSIC TARIFF. USE IN ANY O2 OR UNLOCKED PHONE.